The past few weeks, I have been really getting some amazing overnight. We tend to stuff the stove to the limit using all different kind of splits and species at around 9pm. By 10 o clock the lever is all the way to the left. I wake up at 6:15 am and there is some coal that easy lights kindling and then small splits. I want to say this morning, I could of let the coals burn down even further for an extended burn of 9+ hours. For temperature purposes, it was 71 when I went to bed, and 63 when I woke up. This is the thermometer farthest from the stove. I feel like I'm getting the hang of it!