I don't know about the 5 hours. I run my whole travel trailer including furnace/air conditioner (whichever is needed) fridge, television etc. etc. for at least 12 hours on a tank of gas. My generator has a regulator thingy that adjusts the speed it runs at depending on how much power is being pulled. I also always have 3 or 4 5gallon gas cans full (or at least I hope they are full - I also have a 20 year old son at home who seems to think that any gas laying around is automatically his). I have not had to run my tank off the generator yet *crosses fingers and knocks on head* but I am sure that it would run my pumps for at least 12 hours.
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