Ok fresh start to day1 as no sign of an official win for the team and that seems to be the norm since a long time.
Was day 26 and while up to that point there had been plenty of red ground tgts there was little if any sign of blue movement. As an experiment I saved current situation and ran in x32 offline for 18 hrs but no real advance. Also did the same with all squadrons reverted to HQ but no difference. Perhaps not surprising as the air war HAD been won already.
If there were an obvious group of regular users then it might be reasonable to poll for what majority wanted max campaign length to be but since that's not current situation I think an arbitrary number of 22 days might be the norm in future though I was still having fun at day 26. New arrivals to the server might be put off by overly `quiet` state of play but to totally avoid that maybe a max of day 5 would be needed. (which would not be MY preference).