Bill, if memory serves, about 3-4 hrs, on one load of briquettes. I just let it run vents open, lid on. Tenderness-wise, the thicker pieces were the tenderest (like the best parts of STL trimmed ribs). The thinner parts were a little more overcooked/tougher, but not that tough as when they are cooked as part of a whole spare. Nice trade-off in my book. HTH