my generators, dirtbikes, and plow quad are the only 4-stroke stuff of mine I do actually change the oil on, rototillers, log splitter, chippers, ect just get the oil checked and added to if necessary.
winter time the whole house generator usually gets ran for a week when the power goes down, I have lost power twice in the past for 15 days in a row.
I use a 2200 watt honda to power a propane heater for work in the winter I will get changed 5 or 6 times in a normal winter, I probably put 300 hours a year on it.
if my big generator wasnt soo expensive, and my little one didnt keep me working sometimes in -25 degrees outdoors, I would not be on an oil change schedule with them.