I usually don't try for super long burns, since I find 12 hour reloads to work perfect for me. However, since I was going to be home all day today, I decided to load it up and see what would happen. I didn't take a picture of my load, but it included ash, hard maple, beech, and one ironwood split. The splits were all 16 to 17 inches. I loaded the stove full on hot coals at 7:30 last night. Since the stove can take 22 inch splits, I'd say I had it filled maybe 75% of capacity. Here is a picture of the coals I had left at 1:00 this afternoon after 17.5 hours. This pic was just after I shoveled out some ashes so there were actually a few more coals than this. Stovetop was at 280. View attachment 82526 I actually opened the draft quite a bit after 14 hours to get some more heat out of the coals. Low was mid twenties last night, and a high around 30 today. House was at 68 degrees when I reloaded after 17.5 hours. The new load caught within 15 seconds of shutting the door. I bet I could easily get 20 hour burns (meaning with useable heat not just coals) with longer splits. Of course, a 20 hour burn isn't as convenient for me as a 12 hour burn. So, I'm just going to stick with that. It is nice to know I can get a pretty darn long burn, if needed. Draft setting for the night was just the tiniest bit above completely closed. The house did get up to 73 last night.