Okay, you're about 5.5' taller than my setup, and I have single wall instead of double wall stove pipe. That will likely reduce your burn times some due to higher draft. For sure, it's good to be able to shut things down. I have a couple feet of intake duct and a blast gate out on the end, away from the stove, so I can get to it to shut it down if needed.
Of course I'm not getting hardly any usable heat after 12 hours, but if I still have coals and you don't, that definitely means you can do better and get heat output longer. Even an hour or so longer sounds like it might make a huge difference in your situation. I hope it would be enough to make the difference for your overnight timing.
Here's how I typically load the stove. You can see the smoke starting from the pic of the reload onto coals I've raked to the front, and you can't quite see a couple more pieces hiding back in the dark at the top of the stove. The second photo is a typical top down cold start. I'd probably use a little more kindling around the paper now. Either will yield enough coals for a matchless relight 12 hours later.
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