i put 100-150 each on 3-5 seperate machines each year....all rated for long service intervals 250+ .....so they all get off season service once a year....its very nice to pull each one in the shop and take my time once a year and go thru them with no rush
1.5 months and just over 10 hours. Not a lot since it will be used mainly this fall most. Main use so far for me has been using it on my gravel drive. It is almost 470' long from the road to my larger graveled area prior to the garage.