I get just one use out of carbon steel blades unless I smear them with oil and place in a closed container. I am up to date on my tetanus shots, but I have no desire to put them to the test.
I have been fortunate in that I can get at least a few uses from the blade before rust sets in if I take it out and dry it and leave it in the open air. I’m sure our climate plays a good part in this.