How to exclude a controller (e.g. Notifycontroller ) from devise's session timeout

once define session expire timeout in devise.rb file it is available in entire rails application. But I want to exclude it from some specific controller say "Notifycontroller" which send notification in every couple of minute and my session expiration timeout is define after 30 minutes in devise.rb.

I want keep notifycontroller untouched from devise session expire timeout