This plugin will increase the session time of your WordPress login cookie to 1 year. That way you won't have to login over and over again.
Don’t keep logging in to your WordPress admin panel over and over again. Install this plugin to remain logged in to your blog for up to a year (unless you log out manually).
rk-keep-me-logged-in.php
to the /wp-content/plugins/
directoryIn this version it’s not possible to alter the session time through any settings panel yet. The only possible way is to edit rk-keep-me-logged-in.php manually. You can edit the amount of seconds you want your session to last in line 30.