I'm NEVER done with laundry. 3 kids + 2 adults = mountains of laundry! My son is the biggest mess you ever saw, my older 2 change when they get home as does DH, and everyone thinks that a towel used once is a towel that needs to be washed. You were clean when you used it for heaven's sake, hang it up and use it again! Sorry, pet peeve!
Anyway, I said 15-20, but I think there are weeks that we go over, esp. in the winter with heavy clothes and socks............ oh, don't get me started on the socks....................