Tim, how big are the butts, and how big is the brisket? One thing, you might keep in mind, is that the brisket will take less time per pound than the butts. I typically average around an hour/lb on brisket, and around 1.5 hrs/lb on butts. So, if you have, say, a 14 lb brisket, and say two 8 lb butts, you're probably looking at around 14-16 hours total. Timing is not based on the total weight; as long as they're not one solid mass, they will smoke like individuals. Plan your time based on what will take longest to smoke (the butts). If you rotate the butts & brisket, like Jason does, just keep an eye on the brisket; it will likely finish before the butts. Just my 2¢.