I guess what some call dull and others call dull aren't the same maybe. I might use mine on a dozen or so bows between sharpeing. I don't really count but I sharpen when it doesn't work the way I want. I can easily take a raw stave to finished bow with osage in about 3 hours. ( 5 hours counting coffee and computer breaks) Whitewoods for some reason I like the edge a lot sharper. Osage seems to have some kind of oil in it that lubricates as it cuts. Steve