My Drolet 1800 insert has a 2.4 cubic foot firebox. If I let a big ash bed build up I can hold coals for a while, but usually will be out after 8 hours.Same here. My wife and I found our small Vista can cook us out of our 1,800 sq ft Cape. We spread out our reloads unless it is single digits. Since we have a small firebox we don’t get an overnight burn so we do a cold start every morning.