I just bought my bullet this evening and have it loaded with charcoal. I'm planning on firing it up in an hour or two with a whole pork shoulder. Question....using the minion method,and assuming I get it regulated at 225-250 degrees fairly soon, how long can I figure the water will last? I'm assuming I'll have to get up in the middle of the night to add wood chunks and water, but I'd like to get a relatively good idea of when to set my alarm.