you can go 20 hrs but the cut and efficiency suffers greatly. i have 3" wide blades and i can still tell when they get dull even with the huge amount of momentum. when i used to just mow my own i wouldnt sharpen my blades until it basically wouldnt cut anymore lol. now that i cut a lot of places ive learned its a lot easier to sharpen them often and barely have to take anything off that it is to wait till its too late and have to take half the blade away just to make a good edge again. then you gotta worry about balancing them correctly or youll wear your bearings down fast and cause deck vibration.
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