How can one change the amount of time one's users are logged in. At the moment, it records users logged in after 10 mins. Id like to change that variable. Please advise.

Thank you.

[6.1.1]

I think there are three places to change:

online.php:
$Outdated = $html -> get_date() - 600;

ubbt.inc.php:
$Outdated = $Outdated - 600;

ubbthreads.php:
$LastOn = $date - 600;

If you wanted to change the time interval to 30 minutes, you would change each 600 to 1800 (30 min * 60 sec/min).