I've got two 12 lb boneless pork shoulders for a 4th of July party. So 1.5-2 hours per pound is 18 to 24 hours. Or I could cut them in half and do 9 to 12 hours? Anyone have an opinion? I know my WSM can smoke for 12 hours, but definitely not 24. So if I don't cut them I may have to add unlit charcoal in the middle of the smoking.