For the Fire Pit, a 20# propane tank will last approximately 4 to 4 ½ hours at a continuous burn at the maximum output. The tank will last approximately 8-9 hours at a moderate gas output. For the Fire Table, a 20# propane tank will last approximately 4 to 4 ½ hours at a continuous burn at the maximum output.Click to see full answer. Similarly, is it safe to cook over a propane fire pit?The bottom line, cooking over a propane fire pit is perfectly safe – just keep the media (lava rock or glass) and burner free of food drippings, dirt, debris, etc, to help maintain a clean flame that is free of smoke. Additionally, leftover food residue on your fire pit of any kind can attract insects, rodents, etc.Also Know, how long will Propane last? between 18-20 hours Besides, how long will a 20 lb propane tank last at 50000 BTU? A pound (not gallon) of propane has about 21,600 BTUs gross heat input. At a high level, (21,600×20)= 432,000 BTUs capacity in a full tank. 432,000/50,000 = 8.64 hours.How long will a 20 pound propane tank last? about 18-20 hours
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