Just about every mid sized to large noncats will easily go 8 hours with allot of heatoutput. Yes blaze kings burn slow and long but at much lower heatoutput. The gains in efficency are greatly exaggerated by the bk fan boys. I am not putting down blaze kings at all but i want to give a fair comparison between the two types an in order to burn through a load in the 30 in 3 hours it would have to be run wide open. Doing so is wasting massive ammouts of heat and is not burning it proprly at all. You will actually get much more heat out of the stove by shutting it back and burning it right