I hone mine every time I use it with a steel. Honing is not the same thing as sharpening - op was talking about sharpening. (For those curious - the sharp edge

I hone mine every time I use it with a steel. Honing is not the same thing as sharpening - op was talking about sharpening. (For those curious - the sharp edge on the knife tends to bend over time, which makes it worse at cutting. Running it over a honing steel helps to straighten that bend out but doesn't actually remove metal from the blade. The actual edge will stay sharp for much longer and so you only need to properly sharpen (with a whetstone or if you hate your knives one of those awful swipy wedge things) a decent knife once every 6 months - a year.