Hair grows at different rates for some people, so it kind of depends on how fast or slow your hair grows. But as others have said, about 2 to 3 days i imagine. However, why would you want to after wet shaving? Unless you like the sandpaper feel, and the look of a 0 buzz. I dont, i much prefer the fully sly, smooth look. And im totally addicted to how great a nice freshly wet shaved head feels to the touch!