With an Intact Pork Butt, no injection, etc, get the surface above 130-140 in under 4 hours, which is not hard Hot Smoking, and the time spend heating the interior is irrelevant. Poultry, on the other hand, is frequently Enhanced, Injected with a Salt solution, and therefore Not Intact. You want the internal temp up to 130-140 in 4 hours. If you use All Natural birds, they are Intact and the surface temp is the only concern...JJ