A couple years ago I built one for a guy at work. When I welded an axle on the bottom to attach some wheels, I accidentally burned through in a spot that I didn't notice. When I did my initial burn, air leaked in when I tried to shut it down and I just had to let the charcoal run its course. I think it went well over 30 hours and that wasn't even a full bag. Granted, I wasn't watching temps the whole time and I am sure it cooled a bit but I was amazed at how long it kept going.
Proud owner of the PentaZero
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“I dream of a better tomorrow, where chickens can cross the road and not be questioned about their motives.” ― Ralph Waldo Emerson