I wanted to see how long my mini would run on one load of lump charcoal. I know it doesn't look great, but I'm making a mount for it now. I doubt any of yall will believe me, but it ran 32 hrs. Not kidding. I didn't have anything in it so I know it would be less when it's jammed with food, but it still blew my mind. The crazy thing is I could've put more charcoal in it, so 40 hrs is definitely attainable.