I cooked 3 Boston butts last weekend and they took 17 hours to reach temp> This weekend I am doing 1 so 19 hours and just reached 170. Is this normal or is there some way to speed it up a little. Cooking at 225 with probe rested on the counter for 2 hours before putting it on the smoker. Temps seem to be good. Used to have an offset charcoal smoker that would take 10-12 hours Any advice