So being new to smoking I have discovered conflicting info. I'm cooking two Pork Butts w bone in and each is roughly 10.5 lbs each, and I'm having a hard time deciding when to start cooking them. We would like to start serving at about 5:30 - 6pm. Cooking them together by one standard, 1.5-2 hrs per lb I have read I should be looking at 30-44 hrs. Another standard I read about said, 1 hr per lbs and 20-30mins for an additional butt on same smoker, so I should be looking at 22-33 hours. And a 3rd is that since they are both separate butts and not one whole shoulder it should only take 11-16 hrs. I know there are done when temp is right but having never even cooked one before I'm at a loss of what time I should start mine. Thanks in advance.