Today was shave number 12 with my first English Wilkinson Sword blade and it still seems just as sharp as it did on day 1 and if anything it may actually be getting smoother. I still have another 189 of theses blades left as well as 100 Personna Labs and 50 Schick Krona-Chrome blades and around 100 blades for my Schick Injectors so I figure at a minimum I'm set for at least the next 9 or 10 years and depending on just how long the English Wilkies last I may never have to buy blades again.