Hello all, It's been a while since I posted here. I've smoked several butts on the WSM but always 1 at a time. Never attempted multiple butts. They normally seem to take about an hour to an hour 15 per pound on my smoker. I am smoking a 9.68 lb. and a 9.69 lb. for my mother in law's surprise 50th b-day party tomorrow afternoon. I want to plan for them to finish around 1:30 ish to be ready for the party at 3:30. How much time do I need to add for multiple butts? Any other adjustments I need to plan for? I always get good advice from this site. Thanks a bunch for your help.