I want to smoke a 19lb Pork Soulder Butt in a Master Build electric smoker. I was planning on 225 deg for about 1 1/2 hours per lb. If I wanted it to be ready for dinner at 6:00pm Saturday night that would mean I would need to put it on the smoker at about 9:00pm Friday night. That is around 19 to 20 hours on the smoker is that time correct or should I separate the shoulder from the butt and cutt the time down. Or should I leave it together as one whole piece of meat?