render() times out after 60 seconds with 503 - Service Temporarily Unavailable - cakephp

Question

This code times out in a CakePHP 4.3.3 template with a
503 - Service Temporarily Unavailable.
In a none-CakePHP script it works [it shows after 6 minutes DONE].
ini_set("max_execution_time", "0");
sleep(360);
die("DONE");
The template is called like this:
$this->render("/General/index", "Study");
I didn't find anything regarding a max execution time for rendering but as I can clearly reduce it to the above MCVE, it must be something CakePHP relevant because in CakePHP it stops after 60 seconds, in a PHP file timeout.php, placed directly in the webroot directory, it works.
What am I doing wrong, what I haven't set up properly?
I think, I should present the log entry:
[proxy_fcgi:error] [pid 1813:tid 140621247407872] (70007)The timeout
specified has expired: [client XXXX:56968] AH01075: Error dispatching
request to :
The server is running under Apache/nginx.

Answer 1

I don't understand why a stand-alone script on the same server and same domain works, but under CakePHP it ran into the timeout - with the exactly identical 3 lines of code.
The solution was - after investigating the log error - the Apache2 Timeout.
Additionally, I had to set the nginx timeout settings:
proxy_connect_timeout 3600s;
proxy_send_timeout 3600s;
proxy_read_timeout 3600s;
fastcgi_send_timeout 3600s;
fastcgi_read_timeout 3600s;
After applying the above settings for Apache and nginx it works also under CakePHP.