Nah... with the standard of nutaku, figured I'd use overall PP as opposed to rush day ipp... If we go by just one rush day ipp, 5m++ on any one rush day should get you into top 6-15 easy like you say.
With that said, even that is not overly hard... If you have relatively good weapon grid and reasonable para support, 2 hours of BH during that push day is more than enough to get those 5m
Granted, if your union can't get past 300-400, then that will be quite challenging.