I'm pretty boring .. 7 months after #1 went back to regular as clockwork, 4 months after #2 and 3 months after #3. I don't really count days, I tend to just count from ovulation but its about 4-5 weeks, always has been. I always get ovulation pain so have been using the rhythm method on occasion in the past (works until you get a partner that wants to get you pregnant, but that's another story).

As to how heavy though ... after #2 it got heavier and shorter. And heavier and shorter again after #3. Had to completely change what I use to deal with it all.