New member here, trying my first overnight smoke tonight. 8 pounds of Boston butt, due to the weight and weather forcast I am starting tonight. I will post pics, have read up on it and have a pretty good idea of what I need to do. The only question I really have is how often do most of you have to add to your fire? I am using a chargriller smoking pro, and i know it all comes down to the grill, but just trying to get some average times.