I might as well stick my big foot in too.

Burn time , being the time the fire actually burns, is 2 to 4 hrs.depending on size of fire box, setting of primary air,initial amount of fuel load,type of wood and size of splits.
However the time that the embers continue to glow after flames cease can be up to another 6 hours more.
But the time that you actually get useable heat out of the stove will be the time that the fire actually burns plus the time until the embers no longer heat the house, which will vary according to wood type burned , amt of initial fuel load & outside temp & inside temp.

THEREFORE, I AM GOING TO INVENT A NEW TERM AND CALL IT USEABLE BURN TIME
& it shall be the amount of time of usuable heat that you get out of the stove. This being the sum of the time of the flames, until they cease and the time of the red glows, until the red glows fail to emit enough heat to keep the house warm. And this time shall be different for every stove, even stoves of the same model ,as varing factors are introduced into the parameters due to the different size houses & different temp encountered in each different stove owner’s home. So says eernest4 , so say we all.Amen! (from battlestar galactia)
!:^)

Want to know more?…….. ———-(from starship troopers)
http://www.hearth.com/econtent/index.php/forums/viewthread/16296/