Looking to do my first smoke this weekend on my WSM. Going to do a pulled pork. I would prefer not to wrap it as I like a good tooth to the bark. I know BBQ is "done when it is done". Wanted some thoughts on hedging my bets. Looking at a 5-6lb pork butt. If I give my self a 4 hour cushion to finish (ie want it at 6pm but I shoot for 2pm finish as a safety net) is that a good or enough gauge based on all yall's experience?