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It is not clear to me, after reading this nice piece, if the fire must be kept alive all night long in order to keep the tent warm?

You can build and manage a fire to burn slow, but yea, you do have to get up and add fuel as needed.

Depending where you are, if you can orient the face of the tent towards the sunrise that might warm it up some (so you could snooze a little longer).

I've never done that yet though so I can't say how much. Now I'm curious to know how much that will warm it.