Alter the Loop Timeout limit???

Argh!!!! I can't find the PHP function at www.php.net where I can alter the loop timeout in seconds for the loop that exceed 30 seconds... Yes, I know there is a setting in the php.ini for that but that affect every webpages. I only need the php function only for just one webpage, that is a 'Billing' webpage. It is not surprising that it take longer when there is more customers... Thanks, Scott F.