I have read about some incredible burn times on this site. Can someone tell me how the burn time is measured? Is it from the light of a reload until there are just a few embers left? Is it the actual time between relaods? I have been thinking that it is time between reloads, not the actual time of a fire from start to finish. I would think the time between relaods, if you are burning for optimal heat would be considerably shorter. I am new to heating with wood so please bare with the noobie questions.