It is setup to go into sudden death after the game clock has ended. This means that you can use the gametype with any time (5 minutes, 10 minutes, etc). Although I could make it go off after 7 minutes and 1 second if that is preferred.
I think 7:01 would speed up the game even more. Warzone was introduced to reduce camping back in the days. Once the warzone can't be taken anymore, nobody will move there. So Sudden Death would cause that you have to attack and games could still be stopped after 10 minutes. However I guess testing will show what works best.
Btw once everything works out you also should add this features to the 1 minute later warzone mode.
Bye,
Mauti