wife commented last night that she thinks the stove tends to burn longer when it's warmer. Thinking on this she may be right. It may just be coincidence. when the nights didn't get down too low (35-45) degrees I would load up around 11 at night and get up in the morning around 630 and still have a nice bed of coals. It didn't take too long to get going again. Went to I seem to get shorter burns now that the nights are in the 20's. I think it may be conincidence though, because you never have the same load of wood from time to time. pieces vary in age, size, type of wood, dryness, etc. There is another thing to consider. Since it's cold I tend to run that thing wide open. when it was warmer I would damp down the air a bit so it wasn't quite as hot.