Increased auto logout javascript timer to 10 minutes.

application/layouts/main.phtml

@@ -102,7 +102,7 @@
         <script>
             $(document).foundation();
             $(document).ready(function() {
-                var delay = 300000;
+                var delay = 600000;
                 setTimeout(function(){window.location = "<?php echo $this->link(array('account','logout')) ?>"; }, delay);
             });
         </script>