I just smoked a 6 lbs boston butt at 235-250 degrees and it took 20 hours. At 1.5 hours a lbs it should have been 9-10 Why are they taking so long? does this happen is it normal? I am using a fridge conversions electric smoker that does loose a lot of heat when I open the door but I only opened the door 3 times: when I put it in, when I refilled my smoke maker, and to check the thermometer placement. Does anyone have any input for me?