Why does the script not finish its work and eat up all the memory?

Question

PHP

I call the script in the cron at the following intervals: 30 */3 * * *
As I understand it, it should be called once every three hours.
The script has the following restriction:
ini_set('max_execution_time', '10750');
set_time_limit(10750);
ini_set('memory_limit', '2048M');
That is, it should work for a maximum of 3 hours.
But, based on the logs, the script does not finish its work, but works constantly and clogs all 8 GB of RAM.

Answer 1

Is there a loop in the script?
count the time since the start of the script and kill it if the time is exceeded