I plan to smoke 2 Boston Butts this weekend. I've had much success with cooking them at 1.5 hours per pound. My question is, since I am doing 2 separate butts, do I still go 1.5 hours per pound for the total weight, or just the weight of one? I guess if I have to 8 pound butts, should I expect it to take 12 hours (8*1.5) or 24 hours (16*1.5)? My guess is it may be more like 2 hours per pound or about 16 hours. I wouldn't mind that much if we didn't have company coming over, so I would like to know when I should start them. Thanks!!