Your answers are going to be all over the board on this one. Someone down south isn't going to burn like we do up here in cold country. If it is -20 here, I will burn more than if it is +20. Even those out east are farther south on the hemisphere than we are here so they will probably burn different or less than we do here as well.
But to answer your question, I have a Jensen, holds a full wheelbarrow of wood, and will burn from 9 at night load time til 7 a.m. refill time, although I could probably go till 10a.m. and still have good coals. Just never do. All red oak, all the time. I don't have "shoulder wood", as none of the trees I cut seem to have shoulders.
Ted