I need to correct what I said. Every time I have cooked based on TIME, I have gotten in trouble. I now use a Maverick ET 732 to monitor my meat temperature. If i am cooking multiple meats as you indicate, I have a less expensive Master Forge that I use on the second meat type. My Backwoods Fatboy is very efficient and brisket and ribs are done much sooner than I expect. However, due to variable stall characteristics in pork butts, my limited experience with butts has been that they take longer than the calculated 1.5 hours per pound when cooked at 225. I am going to cook my next butt at 250-260 and try to shorten the cook time. But the whole process for me is based on temperature because I can monitor it without opening the pit to stick something in to find out if it is "as smooth as buttah".
Backwoods Fatboy, CharBroil Bandera, CharBroil Big Red, Red Thermapen, Maverick ET-732