hit the 5 hour 20 min mark when I flushed mine today afer a ride 'round the Columbia river off Portland. Feels good, ...with the river chop and small lake I have next to my house, the 60 horse has performed wonderfully and was a good choice. GF and I have had no problems. Even rinsed the bilge clean today since there were a few drops of coolant that overflowed. Impeller/intake is clean. Flush the exhaust and rinse the machine/trailer thoroughly too after each trip. Awaiting a new LH access cover as 3 tabs are broke and my "manual reverse" is backordered. The orange bumpers and molded side scraper/bumpers were a saver today with all the wind/traffic chop at the docks!