My question is this....I purchased a 12 lb pork shoulder at Costco. When I opened it up it was in two pieces. If I am using my electric smoker at a temperature of 225 degrees, and I am going by the advice of 1-1/2 hours per pound to cook, how much time should I plan on needing? Do I look at this piece as 12 lbs or (2) 6 lb pieces? The party I am attending will begin eating at 2pm. Based on that start time what time should I begin the process? Thanks!