I loaded up the stove at 11pm the other night with pine splits and put one Idaho energy log way in the back on top of a split. Filled the box with splits packed tight. Let the splits catch and when it was up at 450 I cut the air all the way closed. Now when I have an energy log in the stove the secondaries get a little out of control and the stove wants to take off so I have a ball of foil I stick in the rear air intake under the stove. I just close it off a little bit not all the way. Just enough to get the secondaries rolling nice and slow. The stove settled in at 550. I went to bed at 1am. And when I checked the stove at 11am the next morning it was still at 150 and lots of hot coals from the energy log still left burning in the stove. Put a few splits in and off they went. I kept checking the clock not believing I got a twelve hour burn.