drupal_set_time_limit($time_limit)
Attempts to set the PHP maximum execution time.
This function is a wrapper around the PHP function set_time_limit(). When called, set_time_limit() restarts the timeout counter from zero. In other words, if the timeout is the default 30 seconds, and 25 seconds into script execution a call such as set_time_limit(20) is made, the script will run for a total of 45 seconds before timing out.
If the current time limit is not unlimited it is possible to decrease the