diff --git a/core/modules/user/lib/Drupal/user/TempStore.php b/core/modules/user/lib/Drupal/user/TempStore.php
index 3096444..48aee67 100644
--- a/core/modules/user/lib/Drupal/user/TempStore.php
+++ b/core/modules/user/lib/Drupal/user/TempStore.php
@@ -65,11 +65,8 @@ class TempStore {
    * By default, data is stored for one week (604800 seconds) before expiring.
    *
    * @var int
-   *
-   * @todo Currently, this property is not exposed anywhere, and so the only
-   *   way to override it is by extending the class.
    */
-  protected $expire = 604800;
+  protected $expire;
 
   /**
    * Constructs a new object for accessing data from a key/value store.
@@ -83,10 +80,11 @@ class TempStore {
    * @param mixed $owner
    *   The owner key to store along with the data (e.g. a user or session ID).
    */
-  public function __construct(KeyValueStoreExpirableInterface $storage, LockBackendInterface $lockBackend, $owner) {
+  public function __construct(KeyValueStoreExpirableInterface $storage, LockBackendInterface $lockBackend, $owner, $expire) {
     $this->storage = $storage;
     $this->lockBackend = $lockBackend;
     $this->owner = $owner;
+    $this->expire = $expire;
   }
 
   /**
diff --git a/core/modules/user/lib/Drupal/user/TempStoreFactory.php b/core/modules/user/lib/Drupal/user/TempStoreFactory.php
index c93cb58..f1da221 100644
--- a/core/modules/user/lib/Drupal/user/TempStoreFactory.php
+++ b/core/modules/user/lib/Drupal/user/TempStoreFactory.php
@@ -39,6 +39,13 @@ class TempStoreFactory {
   protected $lockBackend;
 
   /**
+   * The time to live for items in seconds.
+   *
+   * @var int
+   */
+  protected $expire;
+
+  /**
    * Constructs a Drupal\user\TempStoreFactory object.
    *
    * @param \Drupal\Component\Serialization\SerializationInterface $serializer
@@ -47,11 +54,14 @@ class TempStoreFactory {
    *   The connection object used for this data.
    * @param \Drupal\Core\Lock\LockBackendInterface $lockBackend
    *   The lock object used for this data.
+   * @param int $expire
+   *   The
    */
-  function __construct(SerializationInterface $serializer, Connection $connection, LockBackendInterface $lockBackend) {
+  function __construct(SerializationInterface $serializer, Connection $connection, LockBackendInterface $lockBackend, $expire = 604800) {
     $this->serializer = $serializer;
     $this->connection = $connection;
     $this->lockBackend = $lockBackend;
+    $this->expire = $expire;
   }
 
   /**
@@ -77,7 +87,7 @@ function get($collection, $owner = NULL) {
 
     // Store the data for this collection in the database.
     $storage = new DatabaseStorageExpirable($collection, $this->serializer, $this->connection);
-    return new TempStore($storage, $this->lockBackend, $owner);
+    return new TempStore($storage, $this->lockBackend, $owner, $this->expire);
   }
 
 }
diff --git a/core/modules/user/tests/Drupal/user/Tests/TempStoreTest.php b/core/modules/user/tests/Drupal/user/Tests/TempStoreTest.php
index af54c81..5889669 100644
--- a/core/modules/user/tests/Drupal/user/Tests/TempStoreTest.php
+++ b/core/modules/user/tests/Drupal/user/Tests/TempStoreTest.php
@@ -82,7 +82,7 @@ protected function setUp() {
     $this->keyValue = $this->getMock('Drupal\Core\KeyValueStore\KeyValueStoreExpirableInterface');
     $this->lock = $this->getMock('Drupal\Core\Lock\LockBackendInterface');
 
-    $this->tempStore = new TempStore($this->keyValue, $this->lock, $this->owner);
+    $this->tempStore = new TempStore($this->keyValue, $this->lock, $this->owner, 604800);
 
     $this->ownObject = (object) array(
       'data' => 'test_data',
diff --git a/core/modules/user/user.services.yml b/core/modules/user/user.services.yml
index 1e8f9b3..c1c30cd 100644
--- a/core/modules/user/user.services.yml
+++ b/core/modules/user/user.services.yml
@@ -53,4 +53,7 @@ services:
     arguments: ['@entity.manager', '@password']
   user.tempstore:
     class: Drupal\user\TempStoreFactory
-    arguments: ['@serialization.phpserialize', '@database', '@lock']
+    arguments: ['@serialization.phpserialize', '@database', '@lock', '%user.tempstore.expire%']
+
+parameters:
+  user.tempstore.expire: 604800