I've used plenty of lump in mine, no issues at all. I do occasionally have to change the inlet to get the temperature I desire, but once there, it has always run fairly consistent. I've never done more than 5 hours and am afraid you would only probably get 6-8 hours on lump.
I pretty much use anything that can burn in mine, including some hardwood for higher temp cooks. It all depends on what you're trying to cook and what temperature you're looking for. Any charcoal should work.
I know Noah recommends KBB, possibly for good reason, but I haven't noticed any negatives with using other brands/lump...
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