I was wondering if anyone has ever smoked a shoulder/butt on a gas grill. Preferably a weber genesis 3 burner front to back with the optional smoke box. A freind at work wants to do one and asked me but I have not used it for that. I know he has done ribs before but never anything like this. He said I should be done in about 8 hours for an 8 pound shoulder/butt RIGHT? I said if you keep it at 225 it will probably take longer. Anyone have any input or suggestions on this one?