This is awesome to hear. I wanted to get an idea because I have 2 FS541V's, both around 1,100 hours. They burn a bit of oil but I keep a constant eye on it. I maintain them meticulously, oil always full and fully follow the manufacturer maintenance schedule. Not worried about these engines for a long time but was just trying to see HOW long they could actually last for.
PS, there is no excuse for leaving fan fins, belts, etc full of grass. We own lawn care companies and have powerful blowers everywhere we are. Blow the thing off for 10 seconds before you hit the trailer and you're good to go. I guess it's tougher when an unsupervised employee is in charge.