Let me know if this is right. 12 hours/day x8mph= 96 miles 25,000 total miles /96 miles per day= 260 days 260 days x12 hours per day= 3120 hours I don't have an owners manuel but let's say that's 13 oil changes, a couple belt changes, a few hydros and maybe replacing the engine once. And he's not even engaging the blades and hes on paved streets for the most part. I would like to think that on "The World's Fastest Mower" this could all be done for under $30,000 less then that if he's getting parts at cost. I'll I know is Walker is the Cat's Meow for all i'm concerned, I've seen numerous walker's with 4000 hours and still running and he's only at about 1000 hours.