I was reading another post and someone said a 20hp motor would last 2000 hrs. Over the years I have settled on 15-1800 hrs as my estimate for the life of a gas powered mower. After that it becomes a game of what will break or quit working today and dealing with the power/speed loss. I'm talking about the mower as a whole and not just the motor. When I'm done with a mower it still runs and will deliver good use for years to come, but I can't trust it because of the down time. Paying the help to come back with a non running mower tends to suck the profit out of a day. My question to the board is this; With proper servicing, how many hours do you get from your mowers before you start having trouble and think about trading or a major overhaul? Please include if you run it yourself or have employees. The owner almost always takes better care of their own machines.