The frequency of sharpening largely depends on how you use your knife. For everyday tasks, a 3CR13 knife might require sharpening every few months. However, if you're using it more intensively or for tougher tasks, you might find the need to sharpen it more often. It's always good to hone the blade regularly to maintain its edge, and when you notice it's not cutting as efficiently, it's time for a proper sharpening session.