Loaded insert last night around 8pm with 2 Envi blocks in the back, then filled with splits. Was fairly warm today so I decided not to load this morning. Opened air all the way to let any coals burn down. About 7pm tonight I assumed I would be starting the stove from a cold start. Couldn't believe there was still some fairly large coals left, from the night before! Almost 24 hours later! Threw a little kindling in and she took off in a few minutes. First pic is what I found almost 24 hours after loading, second is about 10 minutes later.