It depends what kind of apparatus your using to burn the wood. Is it an outdoor fire pit, a wood stove, a natural fire place? Also is the wood split, whole skinned logs, or whole logs with bark? I'm going to assume it's an indoor wood burning stove and your using pre-split seasoned wood.. If that is the case then figure 4 pieces of split wood is roughly one full log, one full log will give you an approximate burning time of .5-1 hour of burn time or hot coals for approximately 2-3 hours pending your apparatus. If you want to maintain a steady burn for all 8 hours use 16-18 split logs if you want to come home to hot coals and restoke the fire you can reduce that number to 8-10. Hope this helped.
It depends how big they are cut, type of wood,you must not be a campfire person. Regular wood cut 6-8" dia.,and 2'long,probably about 10. Just watch 1 burn,then you know when not to put anymore on to burn for only 8 hrs.,good luck.
All depends on what type of wood your burning. Hard wood,dry probably around 15 20 is a good rule of thumb.
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