I have 17 acres. It is a campground so yeah there are rocks, sticks. The two guys that help me mow says that the blades should be sharpened every few weeks. I am not needing a manicured lawn, its a campground! I don't want them sharpening them so often that I will have to replace the blades every year. Am I being unrealistic? Do they really need sharpened so often when I am not looking for a manicured lawn, only shorter grass? Can dull blades make the belts wear out faster? If so, how?