Addon in the attachments.
In case you wanna mod it yourself, the default line is:
<option name="breaker-warning-countdown-start-time" value="30.0" />
Time should be in seconds;
The file attached sets it to 1200s (20min).
Also, I'm not sure what this line does but it doesn't change anything in...
Made this a long time ago (back when SSP was more relevant) and even though most people don't even bother doing SSP anymore, some still do.
So here you go, hope it helps you guys out.