I extend my burn times by using differnt lenghts of wood. My stove will take 32in lenghts. I cut y wood around 20inches. When bucking logs, I always endup with shorth chunks. If I want the fire to last a long time, I put in a layer of 20in wood and then throw a big chunck side ways into the back. Another layer of 20in with another short chunk to the back. Limb wood thats almost to stove limit lenght wise, I leave long and put it on top of the load. I have gone all nite and the next day and still have enough coals to restart the following evening. Lately, its been mid 50'sF and raining. I havent had a fire in two weeks. Thinking about building a Ark.