I shave with a disposable blade, a Mach III in my case.
A friend of mine suggested that I should try keeping the blade in baby oil when I'm not actually shaving with it,
on the theory that this will keep the fine edge from developing rust in the air.
So, I've tried it.
At MOST, I get four shaves out of a Mach III blade when I just carefully rinse it out and pat it dry on a soft cloth.
I took a new blade out of the package and after the first shave, dropped the razor into a small jar of baby oil and there
it sits when I'm not shaving with it.
I've had 16 daily shaves with it and it still shaves like a fresh blade.
Hardly any different than a fresh one right out of the package.
I fully expect to get a month out of a blade at this rate. As compared to three or four days the regular way.
I suggest you try this. Those blades are not cheap. You'll enjoy not spending money on new blades so often.
CJ