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I wonder what the longest single space mission ever was/is. This question doesn't ask for the longest single spaceflight of a human (this are Valery Polyakov's 437 d 18 h on Mir who launched with Soyuz TM-18 and landed with Soyuz TM-20) but for the longest space mission or one could say for the longest flight of a (crewed) spacecraft. This is something that isn't mentioned on Wikipedia. This isn't about space stations either unless the crew (or most of it) on the space station returned in the same spacecraft they launched from Earth with (and the spacecraft remained docked as long as the crew was on the station).

The longest U.S. space mission was Skylab 4 (~ 84 d) and the longest Chinese one was Shenzhou 11 (~ 32.5 d). While these missions look record-suspicious, the longest single mission must have been a Russian one because the Russian Soyuz spacecraft remain docked to Mir and to the ISS very long. As per this list the longest single Russian space mission seems to have been Soyuz TMA-9 at ~ 215 days. Is this the longest space mission ever?

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    $\begingroup$ It's hard to see how you can't answer this yourself as you've already done the research. Your definition of mission duration is a bit odd, missions are over when the space agency that launched it says they are over. $\endgroup$ – GdD Jul 4 '20 at 14:45
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    $\begingroup$ @GdD I changed to "space mission flight". What I mean is what is provided in the 2nd link, a list of spaceflights, I don't mean a stay in space of an individual but rather the longest spaceflight in the same spacecraft (which can include the stay on a space station). Also, if I'm right with Soyuz TMA-9, I wonder why it didn't get any public attention afaik, since it's the longest spaceflight ever. $\endgroup$ – LoveForChrist Jul 4 '20 at 15:11

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