Logged in indefinitely

When logging into the admin area there is a "Remember Me" box that can be checked to stay logged in indefinitely.

Then the session timeout doesn't matter. But if you do want to increase the session timeout length, then that's a PHP setting and one you can simply edit via the php.ini configuration setting for your server. You can change it in you php-configuration on your webserver. Search in php.ini for session.gc_maxlifetime() The value is set in Seconds.
Typically the default is 24 minutes (1440 seconds), but your webhost may have altered the default to something else.

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