Honestly, I have no clue. I can't even remember the last time I bought razors. My last purchase was a 10-pack that I have about 4 or 5 left on - so I probably get anywhere from 3-6 months from a razor, depending on the season (that's legs every 2-3 days in summer, about once a week in the winter, armpits every other day). I keep mine right in a basket on the shower wall, which you might think would lessen the life (dampness), but it doesn't seem to hurt it any.
Meanwhile, I've got a non-expiring coupon for a new pack of razors that I have literally been holding onto for years because I haven't needed to buy new ones yet!
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