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Same. A 20 pack of Gillette Mach 3 disposable razors (not the replacement cartridges, but the full disposable razor) from Costco, lasting 5 years and counting...

Along these lines, a good shave soap + brush, and shaving after I shower means each blade lasts me forever. I still use Mach3's cause I change them maybe 3-4 times a year.

I also do a quick rough shave, then re-lather up my face to get it more carefully, so there's not a lot of pressure on the blade to be super sharp.

And storing it somewhere dry.

I suspect that corrosion is a bigger factor than actual use in limiting the life span of a razor blade.

>keep them sharp using a silicone rubber strop (the Blade Buddy, easily found online)

You can also use a pair of jeans.