So I built this last night. Dimensions are 12x11x8 inches and it fits great in my firebox. I filled it up with my royal oak hardwood to burn off the Crap from welding. I put half a chimney of fully lit charcoal on top and let it go. It only burned for 3 hours at 233 degrees and was gone. I thought this was supposed to give me at least 6-8 hours using the minion method? Any suggestions? Maybe sealing my firebox will be my next step. I want to do overnight cooks in my brinkmann and would like some sleep.