Every time I shower. Generally every other day. I have short hair which makes it easy. I have an easy cut, so I don't even use a hair dryer. It dries on it's own and doesn't require styling (I'm blessed with nice, thick hair). I've tried longer hair a few times during my life, but it was such a hassle to dry and style. I settled on my short hair and have stayed with it for its simplicity (and I think I look best with short hair anyway).