While it depends on how often you're using them, there are a few general guidelines for maintaining a set of perfectly sharp blades. The results after sharpening knives are fabulous. It may not work with a single on or off, Knife sharpener, Knife sharpening stone, Knife set, Sharpening stone, Kitchen knife but it gives the best efficiency. Do I need to sharpen and how often? Your knives should only need to be sharpened every few months depending on how often they are used.