Script aborts after 300 seconds, although max_execution_time = 2400 is defined in php.ini

Question

I have a local XAMPP with PHP 8 installed.

1. echo ini_get('max_execution_time');
   

   also results the

   2400

   from php.ini.

2. echo "Max execution time: ".ini_get("max_execution_time")."<br />";
   echo "Max input time: ".ini_get("max_input_time")."<br />";`
   

   Max execution time: 2400
   Max input time: 60

3. ini_set('MAX_EXECUTION_TIME', '-1');
   

   no change:

   Fatal error: Maximum execution time of 300 seconds exceeded in C:\xampp\htdocs..\inc\datenbank.php on line xx