We've been on an 8 hr reload cycle for weeks. This old house loses heat quickly. Temps are finally, gradually getting a little warmer. With nighttime temps in the low 30s and sunny daytime temps around 45 we are back to 12 hr burn cycles. I am burning mostly wild cherry now. It creates a lot more ash than fir, but it also produces longer lasting coals. Yesterday I got lazy. The house was still comfortable so I delayed until 9pm to reload after a 7am start. 14 hrs and there was still a generous coal bed and a 210º stove top. I like it when that happens.