I actually sent a rescue mission to save one of my kerbals and the science they had on board, and ended up needing to launch a mission to save the rescue mission…

Had to break it up into three launches, two to build the larger ship in orbit and one to fuel it up.

I learned a lot about orbital mechanics that day…

Total time in space was probably about 20 years…

And I may have forgotten about a kerbals in one or two plays…