Last year I Flat out weaned at 90 days, and I had them eating 12lbs/day. I don't think I'd do it again, but I'd give the day weaning a try. I guess you can use the 12 lbs as a point of reference, but they didn't have their dams milk with that. 2/3 would finish their feed every day, the 3rd one was the youngest and would kinda go off and on each feeding.