Fire

Each torch lasts 30 minutes. A lantern lasts for 2 hours per pint. A campfire lasts 1 hour per armload of fuel but how much is 1 armload of fuel in pounds?

a cord of wood is, on average, 4000 pounds, ranging from 3000 to 5000 pounds. We'll use 4000 as a good rough guide.

"Depending on the weather we will go through 1/2 a cord every 2 weeks"

This means 2000 pounds every 2 weeks. That translates to 1000 pounds a week, which translates to about 143 pounds a day. Dividing that by 24 gives us 6 pounds an hour, in theory, assuming the stove is going all day.

Alternatively there are 170 bundles to a cord. That divides down to 24 pounds per bundle. If it takes two bundles for a campfire over night, that's 48 pounds for 8 hours. Divided by 8 gives us 6 pounds an hour for night.

As such, I think I'm safe to say that a fire burns 6 pounds of wood per hour. Soft wood lasts half as long.

A campfire, being exposed to the elements, will last less time than a stove or a fireplace probably, depending on the wind and ambient temperature.