It is interesting to consider this subject. I have put on about 70 hours a year - averaged out. Some years a lot more than other years. I am finally getting to a point where I consider myself a skilled and safe operator - though the "pucker" factor needs calibrating from time to time when I am working in the hills. And I find I am able to figure most things out - eventually - re upkeep and maintenance (with a lot of valuable advice from this forum). The number of hours have dropped off as the major projects have been finished - but I still enjoy every bit of seat time I can get.
The uses have been for mowing, grading, landscaping, taking out and moving trees (logging chains a great help), moving boulders (a lot of boulders - some had to be dragged on a skid), moving dirt in and taking dirt out, putting in fences, hauling material, trenching, road building and more.