The manual for my 4K Onan recommends that you exercise the generator under a load for at least 2 hours a month. That means that if yours is 3 years old, it should have about 72 hours on it if you are exercising it properly. Exercise not only keeps the engine running but under a load keeps the slip rings from corroding. The more you use it, the better it will run and last. Hours meters are not like an odometer on a car.
2008 Winnebago Aspect E450 26A. Oh, yeah, the wife and geriatric Beagle, Irwin, come along too.