A 52k btu stove burns over 6 pounds an hour, on its top setting, so a hopper holding 65 pounds will last 10 hours. As for the ash pan, if you do find your pan to be too small, burning super premium pellets, should have half the ash of your typical premium pellet. My ash pan is the size of a tea cup and I can burn 10 bags, or a typical weeks worth before emptying it, as long as they're super premium. Then again, now that I have a PowerSmith ash vac, I have been doing a quick, 5 sec vacuuming of the pan, since, it's so easy and convenient. Maybe, it's not part of everyone's daily routine, but I do a quick vacuum of my fire grate so vacuuming the ash pan seems easy.