How Do I Prevent Auto-logout???

Hello everyone:

I'm new to Punbb. I would like to ask how to prevent auto logout or at least postpone such behavior, as people may sometimes spend more time typing longer paragraphs.

I think it probably has something to do with sessions, but it doesn't look like Punbb uses php's session handling functions.

Will editing this line work?

in login.php, around line 108

$expire = ($save_pass) ? time() + 1209600 : time() + $forum_config['o_timeout_visit'];

If the above line is not the right place to apply changes, then where should I edit?

Thanks in advance