Mathew,
It depends on the size o your butts:D. I typically use 3-4 hrs base start, then add 1-1.5hrs. per lb. (I.E. 7lb = 10.5hrs, 13.5-14.5hrs total) I run temps 225-230, I also foiled them when I switched racks, because I wanted to speed things up. I did that when the top one probed at...