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Depending on the blade, somewhere between 7 to 20+ shaves (4 passes). Gillette Silver Blue seem to have a good longevity.
FYI below of various type of razors (I have too many) along with maximum shaves per blade in my den.
Astra Superior Platinum: 5 or 6 shaves max.
Feather Hi-Stainles: 3 or 4 shaves max.
Gillette Nacet: 5 or 6 shaves max.
Gillette 7 O'Clock Green Super Stainless: 4 or 5 shaves max.
Gillette 7 O'Clock Yellow SharpEdge: 5 or 6 shaves max.
Gillette Silver Blue: 5 or 6 shaves max.
Gillette Sputnik: 4 or 5 shaves max.
Kai Stainless Steel: 5 or 6 shaves max.
Ladas Super Stainless: 3 or 4 shaves max.
Personna Platinum (Israeli Reds): 5 or 6 shaves max.
Perma-Sharp Super: 7 or 8 shaves max.
Polsilver Super Iridium: 7 or 8 shaves max.
Rapira Platinum Lux: 4 or 5 shaves max.
Rapira Voskhod: 3 or 4 shaves max.
Super Max Blue Diamond Platinum Coated: 2 or 3 shaves max.
Wizamet Polsilver Brown: 5 or 6 shaves max.
German Wilkinson Sword: 4 or 5 shaves max.