Index: wp-login.php
===================================================================
--- wp-login.php	(revision 21425)
+++ wp-login.php	(working copy)
@@ -390,7 +390,7 @@
 	}
 
 	// 10 days
-	setcookie( 'wp-postpass_' . COOKIEHASH, $wp_hasher->HashPassword( stripslashes( $_POST['post_password'] ) ), time() + 864000, COOKIEPATH );
+	setcookie( 'wp-postpass_' . COOKIEHASH, $wp_hasher->HashPassword( stripslashes( $_POST['post_password'] ) ), time() + apply_filters( 'post_password_expiry_length', 864000 ), COOKIEPATH );
 
 	wp_safe_redirect( wp_get_referer() );
 	exit();