This is a question I haven't been able to track down an answer on. My boat has two generators: Kohler 60hz 20kw. Often we will drop anchor some place nice and be at anchor for a few days at a time. 90-100% of the time I will have gen sets running for the air conditioning, refrigerators, TV, music, etc. Usually it is close to 100% of the time. Same is true while we are underway. I haven't been able to track down how long I can run a generator for continuously. Rightly or wrongly, I will run one for about twelve hours and then switch to the other for the next twelve hours. Manuals do not have anything on this, but do recommend a cool down cycle not under load before the generator is shut off. My question is, how long can a generator run for continuously before I should switch over to the second generator? Also, approximately how much fuel does a generator consume (GPH)? I can easily be away from shore power for the bulk of a week at a time and am largely in the dark as to fuel consumption attributable to the boat's generators.