diff --git a/background.js b/background.js
index 43638b4..130c69b 100644
--- a/background.js
+++ b/background.js
@@ -5,6 +5,7 @@ importScripts(
   'shared/settings-schema.js',
   'shared/source-registry.js',
   'shared/flow-capabilities.js',
+  'shared/kiro-timeouts.js',
   'managed-alias-utils.js',
   'mail2925-utils.js',
   'paypal-utils.js',
@@ -12744,8 +12745,8 @@ async function resumeAutoRun() {
 
 const SIGNUP_ENTRY_URL = 'https://chatgpt.com/';
 const SIGNUP_PAGE_INJECT_FILES = ['content/utils.js', 'content/operation-delay.js', 'content/auth-page-recovery.js', 'content/phone-country-utils.js', 'content/phone-auth.js', 'content/signup-page.js'];
-const KIRO_REGISTER_INJECT_FILES = ['shared/source-registry.js', 'content/utils.js', 'content/kiro/register-page.js'];
-const KIRO_DESKTOP_AUTHORIZE_INJECT_FILES = ['shared/source-registry.js', 'content/utils.js', 'content/kiro/desktop-authorize-page.js'];
+const KIRO_REGISTER_INJECT_FILES = ['shared/source-registry.js', 'shared/kiro-timeouts.js', 'content/utils.js', 'content/kiro/register-page.js'];
+const KIRO_DESKTOP_AUTHORIZE_INJECT_FILES = ['shared/source-registry.js', 'shared/kiro-timeouts.js', 'content/utils.js', 'content/kiro/desktop-authorize-page.js'];
 const panelBridge = self.MultiPageBackgroundPanelBridge?.createPanelBridge({
   chrome,
   addLog,
diff --git a/background/kiro/desktop-authorize-runner.js b/background/kiro/desktop-authorize-runner.js
index 7ad6780..68c61bf 100644
--- a/background/kiro/desktop-authorize-runner.js
+++ b/background/kiro/desktop-authorize-runner.js
@@ -3,7 +3,9 @@
 })(typeof self !== 'undefined' ? self : globalThis, function createBackgroundKiroDesktopAuthorizeRunnerModule(root) {
   const kiroStateApi = root.MultiPageBackgroundKiroState || null;
   const desktopClientApi = root.MultiPageBackgroundKiroDesktopClient || null;
+  const kiroTimeoutApi = root.MultiPageKiroTimeouts || null;
   const DEFAULT_REGION = kiroStateApi?.DEFAULT_REGION || desktopClientApi?.DEFAULT_REGION || 'us-east-1';
+  const DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS = kiroTimeoutApi?.DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS || (3 * 60 * 1000);
   const MAIL_2925_FILTER_LOOKBACK_MS = 10 * 60 * 1000;
   const KIRO_DESKTOP_SOURCE_ID = 'kiro-desktop-authorize';
   const KIRO_AWS_VERIFICATION_CODE_PATTERNS = Object.freeze([
@@ -107,6 +109,36 @@
     return fallback;
   }
 
+  function normalizeKiroPageLoadTimeoutMs(value, fallback = DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS) {
+    if (typeof kiroTimeoutApi?.normalizeKiroPageLoadTimeoutMs === 'function') {
+      return kiroTimeoutApi.normalizeKiroPageLoadTimeoutMs(value, fallback);
+    }
+    return normalizePositiveInteger(value, normalizePositiveInteger(fallback, DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS));
+  }
+
+  function createTimeoutBudget(timeoutMs = DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS) {
+    const totalTimeoutMs = normalizeKiroPageLoadTimeoutMs(timeoutMs, DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS);
+    const startedAt = Date.now();
+    return {
+      totalTimeoutMs,
+      getRemainingMs(minimumMs = 1) {
+        const normalizedMinimumMs = normalizePositiveInteger(minimumMs, 1);
+        return Math.max(normalizedMinimumMs, totalTimeoutMs - (Date.now() - startedAt));
+      },
+    };
+  }
+
+  function resolveTimeoutBudget(options = {}, fallbackTimeoutMs = DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS) {
+    if (options?.timeoutBudget && typeof options.timeoutBudget.getRemainingMs === 'function') {
+      return options.timeoutBudget;
+    }
+    return createTimeoutBudget(
+      options?.pageTimeoutMs
+      ?? options?.timeoutMs
+      ?? fallbackTimeoutMs
+    );
+  }
+
   function getErrorMessage(error) {
     return error instanceof Error ? error.message : String(error ?? '未知错误');
   }
@@ -418,9 +450,10 @@
       if (!Number.isInteger(tabId)) {
         throw new Error('缺少 Kiro 桌面授权页标签页，无法重新连接内容脚本。');
       }
+      const timeoutBudget = resolveTimeoutBudget(options);
       if (typeof waitForTabStableComplete === 'function') {
         await waitForTabStableComplete(tabId, {
-          timeoutMs: 45000,
+          timeoutMs: timeoutBudget.getRemainingMs(1000),
           retryDelayMs: 300,
           stableMs: Number(options.stableMs) || 1200,
           initialDelayMs: Number(options.initialDelayMs) || 120,
@@ -430,7 +463,7 @@
         await ensureContentScriptReadyOnTab(KIRO_DESKTOP_SOURCE_ID, tabId, {
           inject: Array.isArray(KIRO_DESKTOP_AUTHORIZE_INJECT_FILES) ? KIRO_DESKTOP_AUTHORIZE_INJECT_FILES : null,
           injectSource: KIRO_DESKTOP_SOURCE_ID,
-          timeoutMs: 45000,
+          timeoutMs: timeoutBudget.getRemainingMs(1000),
           retryDelayMs: 800,
           logMessage: options.injectLogMessage || 'Kiro 桌面授权页已跳转，正在重新连接内容脚本...',
         });
@@ -438,8 +471,15 @@
     }
 
     function buildDesktopRetryRecovery(tabId, options = {}) {
-      return async () => {
+      return async (_error, context = {}) => {
+        const remainingTimeoutMs = normalizeKiroPageLoadTimeoutMs(
+          options?.timeoutBudget?.getRemainingMs?.(1000)
+            ?? context?.remainingTimeoutMs,
+          DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS
+        );
         await reattachDesktopAuthorizePage(tabId, {
+          timeoutMs: remainingTimeoutMs,
+          timeoutBudget: createTimeoutBudget(remainingTimeoutMs),
           stableMs: Number(options.recoveryStableMs) || Number(options.stableMs) || 1200,
           initialDelayMs: Number(options.recoveryInitialDelayMs) || 120,
           injectLogMessage: options.recoveryInjectLogMessage || options.injectLogMessage || 'Kiro 桌面授权页已跳转，正在重新连接内容脚本...',
@@ -451,9 +491,14 @@
       if (!Number.isInteger(tabId)) {
         throw new Error('缺少 Kiro 桌面授权页标签页，无法继续执行。');
       }
+      const pageLoadTimeoutMs = normalizeKiroPageLoadTimeoutMs(
+        options.pageTimeoutMs,
+        DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS
+      );
+      const timeoutBudget = resolveTimeoutBudget(options, pageLoadTimeoutMs);
       if (typeof waitForTabStableComplete === 'function') {
         await waitForTabStableComplete(tabId, {
-          timeoutMs: 45000,
+          timeoutMs: timeoutBudget.getRemainingMs(1000),
           retryDelayMs: 300,
           stableMs: Number(options.stableMs) || 1200,
           initialDelayMs: Number(options.initialDelayMs) || 120,
@@ -463,19 +508,23 @@
         await ensureContentScriptReadyOnTab(KIRO_DESKTOP_SOURCE_ID, tabId, {
           inject: Array.isArray(KIRO_DESKTOP_AUTHORIZE_INJECT_FILES) ? KIRO_DESKTOP_AUTHORIZE_INJECT_FILES : null,
           injectSource: KIRO_DESKTOP_SOURCE_ID,
-          timeoutMs: 45000,
+          timeoutMs: timeoutBudget.getRemainingMs(1000),
           retryDelayMs: 800,
           logMessage: options.injectLogMessage || 'Kiro 桌面授权页内容脚本未就绪，正在等待页面恢复...',
         });
       }
+      const stateWaitTimeoutMs = timeoutBudget.getRemainingMs(1000);
       const result = await sendToContentScriptResilient(KIRO_DESKTOP_SOURCE_ID, {
         type: 'GET_KIRO_DESKTOP_AUTHORIZE_STATE',
         step: options.step || 0,
         source: 'background',
       }, {
-        timeoutMs: 30000,
+        timeoutMs: stateWaitTimeoutMs,
         retryDelayMs: 700,
-        onRetryableError: buildDesktopRetryRecovery(tabId, options),
+        onRetryableError: buildDesktopRetryRecovery(tabId, {
+          ...options,
+          timeoutBudget,
+        }),
         logMessage: options.readyLogMessage || '正在读取 Kiro 桌面授权页状态...',
       });
       if (result?.error) {
diff --git a/background/kiro/register-runner.js b/background/kiro/register-runner.js
index 812ab88..0ef1d2e 100644
--- a/background/kiro/register-runner.js
+++ b/background/kiro/register-runner.js
@@ -2,8 +2,10 @@
   root.MultiPageBackgroundKiroRegisterRunner = factory(root);
 })(typeof self !== 'undefined' ? self : globalThis, function createBackgroundKiroRegisterRunnerModule(root) {
   const kiroStateApi = root.MultiPageBackgroundKiroState || null;
+  const kiroTimeoutApi = root.MultiPageKiroTimeouts || null;
   const DEFAULT_REGION = kiroStateApi?.DEFAULT_REGION || 'us-east-1';
   const DEFAULT_TARGET_ID = kiroStateApi?.DEFAULT_TARGET_ID || 'kiro-rs';
+  const DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS = kiroTimeoutApi?.DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS || (3 * 60 * 1000);
   const DEVICE_LOGIN_START_URL = 'https://view.awsapps.com/start';
   const DEFAULT_SCOPES = Object.freeze([
     'codewhisperer:completions',
@@ -120,6 +122,36 @@
     return fallback;
   }
 
+  function normalizeKiroPageLoadTimeoutMs(value, fallback = DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS) {
+    if (typeof kiroTimeoutApi?.normalizeKiroPageLoadTimeoutMs === 'function') {
+      return kiroTimeoutApi.normalizeKiroPageLoadTimeoutMs(value, fallback);
+    }
+    return normalizePositiveInteger(value, normalizePositiveInteger(fallback, DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS));
+  }
+
+  function createTimeoutBudget(timeoutMs = DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS) {
+    const totalTimeoutMs = normalizeKiroPageLoadTimeoutMs(timeoutMs, DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS);
+    const startedAt = Date.now();
+    return {
+      totalTimeoutMs,
+      getRemainingMs(minimumMs = 1) {
+        const normalizedMinimumMs = normalizePositiveInteger(minimumMs, 1);
+        return Math.max(normalizedMinimumMs, totalTimeoutMs - (Date.now() - startedAt));
+      },
+    };
+  }
+
+  function resolveTimeoutBudget(options = {}, fallbackTimeoutMs = DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS) {
+    if (options?.timeoutBudget && typeof options.timeoutBudget.getRemainingMs === 'function') {
+      return options.timeoutBudget;
+    }
+    return createTimeoutBudget(
+      options?.pageTimeoutMs
+      ?? options?.timeoutMs
+      ?? fallbackTimeoutMs
+    );
+  }
+
   function buildOidcBaseUrl(region = DEFAULT_REGION) {
     return `https://oidc.${normalizeRegion(region)}.amazonaws.com`;
   }
@@ -485,9 +517,10 @@
       if (!Number.isInteger(tabId)) {
         throw new Error('缺少 Kiro 注册页标签页，无法重新连接内容脚本。');
       }
+      const timeoutBudget = resolveTimeoutBudget(options);
       if (typeof waitForTabStableComplete === 'function') {
         await waitForTabStableComplete(tabId, {
-          timeoutMs: 45000,
+          timeoutMs: timeoutBudget.getRemainingMs(1000),
           retryDelayMs: 300,
           stableMs: Number(options.stableMs) || 1200,
           initialDelayMs: Number(options.initialDelayMs) || 120,
@@ -497,7 +530,7 @@
         await ensureContentScriptReadyOnTab(KIRO_REGISTER_PAGE_SOURCE_ID, tabId, {
           inject: Array.isArray(KIRO_REGISTER_INJECT_FILES) ? KIRO_REGISTER_INJECT_FILES : null,
           injectSource: KIRO_REGISTER_PAGE_SOURCE_ID,
-          timeoutMs: 45000,
+          timeoutMs: timeoutBudget.getRemainingMs(1000),
           retryDelayMs: 800,
           logMessage: options.injectLogMessage || 'Kiro 注册页已跳转，正在重新连接内容脚本...',
         });
@@ -505,8 +538,15 @@
     }
 
     function buildKiroRetryRecovery(tabId, options = {}) {
-      return async () => {
+      return async (_error, context = {}) => {
+        const remainingTimeoutMs = normalizeKiroPageLoadTimeoutMs(
+          options?.timeoutBudget?.getRemainingMs?.(1000)
+            ?? context?.remainingTimeoutMs,
+          DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS
+        );
         await reattachKiroRegisterPage(tabId, {
+          timeoutMs: remainingTimeoutMs,
+          timeoutBudget: createTimeoutBudget(remainingTimeoutMs),
           stableMs: Number(options.recoveryStableMs) || Number(options.stableMs) || 1200,
           initialDelayMs: Number(options.recoveryInitialDelayMs) || 120,
           injectLogMessage: options.recoveryInjectLogMessage || options.injectLogMessage || 'Kiro 注册页已跳转，正在重新连接内容脚本...',
@@ -518,9 +558,14 @@
       if (!Number.isInteger(tabId)) {
         throw new Error('缺少 Kiro 注册页标签页，无法继续执行。');
       }
+      const pageLoadTimeoutMs = normalizeKiroPageLoadTimeoutMs(
+        options.pageTimeoutMs,
+        DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS
+      );
+      const timeoutBudget = resolveTimeoutBudget(options, pageLoadTimeoutMs);
       if (typeof waitForTabStableComplete === 'function') {
         await waitForTabStableComplete(tabId, {
-          timeoutMs: 45000,
+          timeoutMs: timeoutBudget.getRemainingMs(1000),
           retryDelayMs: 300,
           stableMs: Number(options.stableMs) || 1500,
           initialDelayMs: Number(options.initialDelayMs) || 150,
@@ -530,7 +575,7 @@
         await ensureContentScriptReadyOnTab(KIRO_REGISTER_PAGE_SOURCE_ID, tabId, {
           inject: Array.isArray(KIRO_REGISTER_INJECT_FILES) ? KIRO_REGISTER_INJECT_FILES : null,
           injectSource: KIRO_REGISTER_PAGE_SOURCE_ID,
-          timeoutMs: 45000,
+          timeoutMs: timeoutBudget.getRemainingMs(1000),
           retryDelayMs: 800,
           logMessage: options.injectLogMessage || 'Kiro 注册页内容脚本未就绪，正在等待页面恢复...',
         });
@@ -541,20 +586,24 @@
           url: '',
         };
       }
+      const stateWaitTimeoutMs = timeoutBudget.getRemainingMs(1000);
       const result = await sendToContentScriptResilient(KIRO_REGISTER_PAGE_SOURCE_ID, {
         type: 'ENSURE_KIRO_PAGE_STATE',
         step: options.step || 0,
         source: 'background',
         payload: {
           targetStates: Array.isArray(options.targetStates) ? options.targetStates : [],
-          timeoutMs: Number(options.pageTimeoutMs) || 30000,
+          timeoutMs: stateWaitTimeoutMs,
           retryDelayMs: Number(options.pageRetryDelayMs) || 250,
           timeoutMessage: options.timeoutMessage || '',
         },
       }, {
-        timeoutMs: Math.max(30000, Number(options.pageTimeoutMs) || 30000),
+        timeoutMs: stateWaitTimeoutMs,
         retryDelayMs: 700,
-        onRetryableError: buildKiroRetryRecovery(tabId, options),
+        onRetryableError: buildKiroRetryRecovery(tabId, {
+          ...options,
+          timeoutBudget,
+        }),
         logMessage: options.readyLogMessage || '正在等待 Kiro 页面进入下一状态...',
       });
       if (result?.error) {
@@ -567,9 +616,14 @@
       if (!Number.isInteger(tabId)) {
         throw new Error('缺少 Kiro 注册页标签页，无法继续执行。');
       }
+      const pageLoadTimeoutMs = normalizeKiroPageLoadTimeoutMs(
+        options.pageTimeoutMs,
+        DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS
+      );
+      const timeoutBudget = resolveTimeoutBudget(options, pageLoadTimeoutMs);
       if (typeof waitForTabStableComplete === 'function') {
         await waitForTabStableComplete(tabId, {
-          timeoutMs: 45000,
+          timeoutMs: timeoutBudget.getRemainingMs(1000),
           retryDelayMs: 300,
           stableMs: Number(options.stableMs) || 1200,
           initialDelayMs: Number(options.initialDelayMs) || 120,
@@ -579,7 +633,7 @@
         await ensureContentScriptReadyOnTab(KIRO_REGISTER_PAGE_SOURCE_ID, tabId, {
           inject: Array.isArray(KIRO_REGISTER_INJECT_FILES) ? KIRO_REGISTER_INJECT_FILES : null,
           injectSource: KIRO_REGISTER_PAGE_SOURCE_ID,
-          timeoutMs: 45000,
+          timeoutMs: timeoutBudget.getRemainingMs(1000),
           retryDelayMs: 800,
           logMessage: options.injectLogMessage || 'Kiro 注册页切换中，正在等待页面恢复...',
         });
@@ -587,20 +641,24 @@
       if (typeof sendToContentScriptResilient !== 'function') {
         return { state: '', url: '' };
       }
+      const stateWaitTimeoutMs = timeoutBudget.getRemainingMs(1000);
       const result = await sendToContentScriptResilient(KIRO_REGISTER_PAGE_SOURCE_ID, {
         type: 'ENSURE_KIRO_STATE_CHANGE',
         step: options.step || 0,
         source: 'background',
         payload: {
           fromStates: Array.isArray(options.fromStates) ? options.fromStates : [],
-          timeoutMs: Number(options.pageTimeoutMs) || 30000,
+          timeoutMs: stateWaitTimeoutMs,
           retryDelayMs: Number(options.pageRetryDelayMs) || 250,
           timeoutMessage: options.timeoutMessage || '',
         },
       }, {
-        timeoutMs: Math.max(30000, Number(options.pageTimeoutMs) || 30000),
+        timeoutMs: stateWaitTimeoutMs,
         retryDelayMs: 700,
-        onRetryableError: buildKiroRetryRecovery(tabId, options),
+        onRetryableError: buildKiroRetryRecovery(tabId, {
+          ...options,
+          timeoutBudget,
+        }),
         logMessage: options.readyLogMessage || '正在等待 Kiro 页面完成跳转...',
       });
       if (result?.error) {
diff --git a/content/kiro/register-page.js b/content/kiro/register-page.js
index 36cac37..02e06f2 100644
--- a/content/kiro/register-page.js
+++ b/content/kiro/register-page.js
@@ -1,6 +1,7 @@
 console.log('[MultiPage:kiro-register-page] Content script loaded on', location.href);
 
 const KIRO_REGISTER_PAGE_LISTENER_SENTINEL = 'data-multipage-kiro-register-page-listener';
+const DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS = globalThis.MultiPageKiroTimeouts?.DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS || (3 * 60 * 1000);
 const KIRO_CONTINUE_TEXT_PATTERN = /continue|继续/i;
 const KIRO_CONFIRM_CONTINUE_TEXT_PATTERN = /confirm and continue|确认并继续/i;
 const KIRO_ALLOW_ACCESS_TEXT_PATTERN = /allow access|允许访问/i;
@@ -312,7 +313,7 @@ function detectKiroRegisterPageState() {
 }
 
 async function waitForKiroState(predicate, options = {}) {
-  const timeoutMs = Math.max(1000, Math.floor(Number(options.timeoutMs) || 30000));
+  const timeoutMs = Math.max(1000, Math.floor(Number(options.timeoutMs) || DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS));
   const retryDelayMs = Math.max(100, Math.floor(Number(options.retryDelayMs) || 250));
   const start = Date.now();
 
@@ -405,7 +406,7 @@ async function submitKiroEmail(payload = {}) {
 
   const readyState = await ensureKiroRegisterPageState({
     targetStates: ['email_entry'],
-    timeoutMs: payload?.timeoutMs || 30000,
+    timeoutMs: payload?.timeoutMs || DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS,
     retryDelayMs: payload?.retryDelayMs || 250,
   });
   if (!readyState.emailInput || !readyState.continueButton) {
@@ -430,7 +431,7 @@ async function submitKiroName(payload = {}) {
 
   const readyState = await ensureKiroRegisterPageState({
     targetStates: ['name_entry'],
-    timeoutMs: payload?.timeoutMs || 30000,
+    timeoutMs: payload?.timeoutMs || DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS,
     retryDelayMs: payload?.retryDelayMs || 250,
   });
   if (!readyState.nameInput || !readyState.continueButton) {
@@ -455,7 +456,7 @@ async function submitKiroVerificationCode(payload = {}) {
 
   const readyState = await ensureKiroRegisterPageState({
     targetStates: ['otp_page'],
-    timeoutMs: payload?.timeoutMs || 30000,
+    timeoutMs: payload?.timeoutMs || DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS,
     retryDelayMs: payload?.retryDelayMs || 250,
   });
   if (!readyState.otpInput || !readyState.verifyButton) {
@@ -480,7 +481,7 @@ async function submitKiroPassword(payload = {}) {
 
   const readyState = await ensureKiroRegisterPageState({
     targetStates: ['password_page'],
-    timeoutMs: payload?.timeoutMs || 30000,
+    timeoutMs: payload?.timeoutMs || DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS,
     retryDelayMs: payload?.retryDelayMs || 250,
   });
   if (!readyState.passwordInput || !readyState.continueButton) {
@@ -511,7 +512,7 @@ async function submitKiroPassword(payload = {}) {
 async function confirmKiroRegisterConsent(payload = {}) {
   let currentState = await ensureKiroRegisterPageState({
     targetStates: ['authorization_page', 'success_page'],
-    timeoutMs: payload?.timeoutMs || 45000,
+    timeoutMs: payload?.timeoutMs || DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS,
     retryDelayMs: payload?.retryDelayMs || 250,
   });
 
@@ -528,7 +529,7 @@ async function confirmKiroRegisterConsent(payload = {}) {
     });
     simulateClick(currentState.actionButton);
     currentState = await waitForKiroAuthorizationAdvance(currentState, {
-      timeoutMs: payload?.timeoutMs || 45000,
+      timeoutMs: payload?.timeoutMs || DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS,
       retryDelayMs: payload?.retryDelayMs || 250,
       timeoutMessage: 'Kiro 授权按钮点击后页面未继续，请检查当前授权页状态。',
     });
diff --git a/shared/kiro-timeouts.js b/shared/kiro-timeouts.js
new file mode 100644
index 0000000..2c1cbc3
--- /dev/null
+++ b/shared/kiro-timeouts.js
@@ -0,0 +1,25 @@
+(function attachKiroTimeouts(root, factory) {
+  root.MultiPageKiroTimeouts = factory();
+})(typeof self !== 'undefined' ? self : globalThis, function createKiroTimeoutsModule() {
+  const DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS = 3 * 60 * 1000;
+
+  function normalizePositiveInteger(value, fallback) {
+    const numeric = Math.floor(Number(value));
+    if (Number.isInteger(numeric) && numeric > 0) {
+      return numeric;
+    }
+    return fallback;
+  }
+
+  function normalizeKiroPageLoadTimeoutMs(value, fallback = DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS) {
+    return normalizePositiveInteger(
+      value,
+      normalizePositiveInteger(fallback, DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS)
+    );
+  }
+
+  return {
+    DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS,
+    normalizeKiroPageLoadTimeoutMs,
+  };
+});
diff --git a/tests/background-kiro-desktop-authorize-runner-module.test.js b/tests/background-kiro-desktop-authorize-runner-module.test.js
index e8f957f..d5a11f2 100644
--- a/tests/background-kiro-desktop-authorize-runner-module.test.js
+++ b/tests/background-kiro-desktop-authorize-runner-module.test.js
@@ -46,3 +46,12 @@ test('parseDesktopCallbackUrl validates state and redirect port', () => {
   );
   assert.equal(badPort, null);
 });
+
+test('kiro desktop authorize runner uses a shared 3-minute page-load timeout budget', () => {
+  const source = fs.readFileSync('background/kiro/desktop-authorize-runner.js', 'utf8');
+  assert.match(source, /DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS/);
+  assert.match(source, /createTimeoutBudget/);
+  assert.match(source, /resolveTimeoutBudget/);
+  assert.match(source, /timeoutBudget\.getRemainingMs\(1000\)/);
+  assert.match(source, /onRetryableError: buildDesktopRetryRecovery\(tabId, \{\s*\.\.\.options,\s*timeoutBudget,/);
+});
diff --git a/tests/background-kiro-register-runner-module.test.js b/tests/background-kiro-register-runner-module.test.js
index 34ccfc2..2129642 100644
--- a/tests/background-kiro-register-runner-module.test.js
+++ b/tests/background-kiro-register-runner-module.test.js
@@ -57,3 +57,12 @@ test('startBuilderIdDeviceLogin registers Builder ID client and returns login bo
   assert.equal(result.interval, 7);
   assert.equal(result.region, 'us-east-1');
 });
+
+test('kiro register runner uses a shared 3-minute page-load timeout budget', () => {
+  const source = fs.readFileSync('background/kiro/register-runner.js', 'utf8');
+  assert.match(source, /DEFAULT_KIRO_PAGE_LOAD_TIMEOUT_MS/);
+  assert.match(source, /createTimeoutBudget/);
+  assert.match(source, /resolveTimeoutBudget/);
+  assert.match(source, /timeoutBudget\.getRemainingMs\(1000\)/);
+  assert.match(source, /onRetryableError: buildKiroRetryRecovery\(tabId, \{\s*\.\.\.options,\s*timeoutBudget,/);
+});
diff --git a/tests/background-step-modules.test.js b/tests/background-step-modules.test.js
index 96b2086..1651099 100644
--- a/tests/background-step-modules.test.js
+++ b/tests/background-step-modules.test.js
@@ -16,6 +16,7 @@ test('background imports workflow step modules including rebuilt Kiro modules',
     'background/steps/fetch-login-code.js',
     'background/steps/confirm-oauth.js',
     'background/steps/platform-verify.js',
+    'shared/kiro-timeouts.js',
     'background/kiro/state.js',
     'background/kiro/register-runner.js',
     'background/kiro/desktop-client.js',
diff --git a/tests/source-registry-module.test.js b/tests/source-registry-module.test.js
index 861dca2..3178232 100644
--- a/tests/source-registry-module.test.js
+++ b/tests/source-registry-module.test.js
@@ -15,6 +15,7 @@ test('background imports shared source registry module', () => {
   assert.match(source, /shared\/flow-registry\.js/);
   assert.match(source, /shared\/settings-schema\.js/);
   assert.match(source, /shared\/source-registry\.js/);
+  assert.match(source, /shared\/kiro-timeouts\.js/);
 });
 
 test('manifest loads shared source registry before content utils in static bundles', () => {
@@ -41,6 +42,18 @@ test('manifest no longer ships a static Kiro content bundle', () => {
   assert.equal(hasStaticKiroBundle, false);
 });
 
+test('background injects shared Kiro timeout module before Kiro content scripts', () => {
+  const source = fs.readFileSync('background.js', 'utf8');
+  assert.match(
+    source,
+    /const KIRO_REGISTER_INJECT_FILES = \['shared\/source-registry\.js', 'shared\/kiro-timeouts\.js', 'content\/utils\.js', 'content\/kiro\/register-page\.js'\];/
+  );
+  assert.match(
+    source,
+    /const KIRO_DESKTOP_AUTHORIZE_INJECT_FILES = \['shared\/source-registry\.js', 'shared\/kiro-timeouts\.js', 'content\/utils\.js', 'content\/kiro\/desktop-authorize-page\.js'\];/
+  );
+});
+
 test('shared source registry exposes canonical Kiro sources and drivers', () => {
   const registry = loadSourceRegistry();