--- a/services/sync/modules/engines/tabs.js
+++ b/services/sync/modules/engines/tabs.js
@@ -1,17 +1,17 @@
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 this.EXPORTED_SYMBOLS = ["TabEngine", "TabSetRecord"];
 
 var {classes: Cc, interfaces: Ci, utils: Cu} = Components;
 
-const TABS_TTL = 604800;           // 7 days.
+const TABS_TTL = 1814400;          // 21 days.
 const TAB_ENTRIES_LIMIT = 25;      // How many URLs to include in tab history.
 
 Cu.import("resource://gre/modules/Preferences.jsm");
 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 Cu.import("resource://services-sync/engines.js");
 Cu.import("resource://services-sync/engines/clients.js");
 Cu.import("resource://services-sync/record.js");
 Cu.import("resource://services-sync/util.js");