My dad has a sawmill of his own (WM LT40-Manual) he has a fair amount of slabs to burn. He mostly uses them during the day, when loads are light or during the summer for heating DHW.
He likes to use the bigger pieces and blocks for overnight. He does not go any extended burn times, as he checks the stove 2 or 3 times a day in the winter, depending on what the weather looks like. He is firing a CB eClassic 2300 or 2400 (cant remember exactly), and heating 7000sf over 2 building (mostly in slab, with some aluminum panels) BTW he has burned about 37 cords in the last 2 years, yes almost 4 semis worht of wood; but ma is happy so he is happy.