But just how many years will it take to reach stage four? I have a Dexter 12-inch steaking knife I run through a ChefChoice every fall before butchering my deer. In a really good season I may butcher 4 or 5, an average year a couple. Once the edge is touched up on the ChefsChoice, it is steeled on a EZE-LAP diamond rod as I work. The knife has been in use for maybe 25-30 years now and it might have as much wear as stage 2 on your drawing. Of course, the drawing is a complete exaggeration the wear pattern. from the machine.