Waiting three minutes before the war starts is absurd. It’s an enormous waste of time. If your faction does a hundred wars, that‘s five full hours of just sitting there waiting for it to start. I can’t see the purpose of such a long waiting period.
At the very least, cut it in half. We can easily get another five wars in and most likely more. At best, make it forty-five seconds. I can’t see needing more time than that to prepare.
Seriously, consider it.