Usually about every three to four days. I'm still working on my technique, and I often get nicks and irritation, so I'd rather not shave daily and have a perpetually irritated face. I'll shave for a job interview or if I feel like an occasion calls for it, but I almost always shave about two times a week. I'm also finding that I get better results without a pre-shave shower. I just make sure my lather is good and wet, the razor cuts the whiskers no problem. My skin seems more susceptible to cuts and irritation after a shower, plus I wear glasses and prefer to use a mirror for my shave, both of which get fogged up if the bathroom is full of condensation following a hot shower.