I don't know if this is because the hair is longer and easier to cut, but I find I get my best shaves right around the 72 hour mark. The shaves are closer and more comfortable. I know shaving every 3 days is sacrilege to some, but it works for me. Anyway, I'm a dailyhead shaver now, so I actually do shave every day. The aforementioned 72 hours refers to facial shaves. So, any one else find this to be true for them?