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I have found that Gillette 365 blades last around 5 days. But I like to rotate blades - I take a blade tray and place around 3 different brands of blade in the tray. At the moment I have a blade tray with Feather, WS Classic, Dorco 301, and 365 in alternate layers. When I get to the last 5 blades (I use an old blade inlay card to indicate this) I place another 5 from a different brand and put them in alternate layers to the previous 5 get even more variety, and so on.
Most blades last 4 days.
Most blades last 4 days.