I have a smallish stove and get maybe four or five hours of heat from it, so you're not too far off if you're getting four hours between reloads. A lot depends on the wood. If you post pictures we can probably tell you the sort of wood you have - show the bark, end of splits, and the side of splits if possible.
I agree with everyone else that you shouldn't load too much wood too soon on hot coals. Try raking the coals to the front and adding just one split on top. I get lots of heat this way and the coals burn down. Sometimes I repeat this several times to get the coals burnt down, and get hours of heat from just a few new splits.
I agree with everyone else that you shouldn't load too much wood too soon on hot coals. Try raking the coals to the front and adding just one split on top. I get lots of heat this way and the coals burn down. Sometimes I repeat this several times to get the coals burnt down, and get hours of heat from just a few new splits.