Just like with pulled pork the brisket decides when it's done. 3.25 pounds of the flat put in at 9:30am at 240. Finally pulled out at 6:00pm, one thermometer read 179 the other 191. Wrapped in foil blanket for 1 hour then served. Logic would say that is way to much time for a flat at 3.25 pounds. Plateau lasted about 2 hours!!!! Just a FYI for those that need time frames! Oh and it came out amazing