A friend of mine offered to sharpen a set of my blades in trade for some other work. He was appalled at the condition of my blades. He has been in the business for 10 years said that he sharpens his blades every day. I use a JD Quiktrak 657 54" deck with a 23 HP Kawasaki. I probably mowed 4 hours a day with it last year but sharpened the blades only once! Never did I get a complaint about the look of the lawn. In fact, I got many compliments. The lawns I did with these "dull" blades looks exquisite. So here is what I wonder . . . Is sharpening every 8 hours overkill (and a waste of time and money)? Maybe my JD is just such a better mower (than his Toro) that it makes up for me using dull blades? Have there been any studies that PROOVE that sharpening blades every day is necessary? (If not, maybe I just discovered a new way how to save us all time and money.) Or . . . maybe I need glasses. By the way, the lawns I cut did not suffer any health issues that I noticed.