I can get away with two or even three days easy, as my beard is rather thin (both in thickness of the stubble and density of follicles), and also a light color. On the other hand, it grows fast enough that there is definitely stubble to remove after 24 hours. Since my skin can handle it and I enjoy the practice of shaving as well as the feel of a clean shave, I wind up shaving 6 or 7 days a week. That said, I end up only shaving a single WTG pass about half of the time.