Since the weather is milder my burn times are going up. Came home at 3AM 15hrs from the last time I loaded only 3 splits in the stove. Still found enough coals for a quick start. Put in 5 medium splits at 3AM and just now at noon loaded it again with a stove top of 300 degrees. Not bad for an unlisted un tested stove. And the wood was Silver maple and one piece of Elm both times. I'm thinking once I start heating drywall instead of concrete and start burning Oak, Ash, and OO I might be able to squeeze 20+ hrs out of it.