PHP timeout

how to set PHP timeout to nomax?

I have a PHP script that is run using HTTPGETCLOB. It runs as part of a
batch job on the IBM i. Getting HTTP response code 408 - request timeout.

Java stored procedure or user-defined function SYSTOOLS.HTTPGETCLOB,
specific name HTTPG00005 aborted with an exception "Server returned
HTTP response code: 408 for URL:
http://172.16.1.254:10080/marketing/dropbox_importProdOnHand.php";.

this error returns in 60 seconds.

In the PHP script I run:
set_time_limit(0);
ini_set('max_execution_time', 300);

in PHP.INI, there is this:
max_execution_time=30

and the apache httpd.conf file has
TimeOut 30000