Fellow DE razor users, pardon if this is a very "old hat" here. I searched but couldn't find anything related ...
Anyway, I store my razors that are in my rotation and loaded with a blade sitting on a magnet. Just a regular office (ferrit) magnet will do, a stronger neodym magnet will do better. I get 3 to 5 shaves (2 passes) regular usage from a blade. With the magnets I easily extend this to 3 weeks. Sometimes I can't remember when I actually last time put a new blade in. There is no scientific proof of any kind just personal experience. You get yourself a magnet for 2 bucks, ok the neodyms are maybe $4-5 a piece and give it a try. I change the blade edge that sits on the magnet everyday i.e. turning the razors so both edges get their fair share of magnet exposure. Works for me and just wanted to share it here.
Here the Mergress on the neodym magnet:
And here a 37c on a ferrit magnet: