I’ve had my tractor for 3 and a half years and just completed my 600 hour maintenance. It was delivered on May 6th, 2019. I did the 50 hour on July 13th, 2019. I use it year round, winter for snow blowing, and the rest of the time for everything else. With all the implements I have, I rarely go a week where it isn’t being used for something. Even when I’m sawing logs on my sawmill, it comes in handy for loading logs, and carrying lumber to my drying racks.
One of my neighbors has a 2014, L4701, and he changed his oil this summer at 160 hours. He does blow snow in the winter, but not much use in the summer. I think he changed the oil just because it sits for long periods.