Since you're all Covid experts here, tell me, how long does the immunity last after recovering from Covid?

Did you get the jabs, or did you not get the jabs? If you have the jabs the immunity against the specific sub-variant spike proteins the jabs are designed for lasts about a month than begins to go away but at the same time your natural immune response to Covid does not work.

if you don't have the jabs you will have developed full natural immunity that is inate and automatically adaptable to 'meet the challenge of manned spaceflight' so to speak.