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It appears that the first manned Crew Dragon flight to ISS may be extended due to there being only one US astronaut there.

NASA is also trying to determine how long Dragon's first crewed mission will take. Initially, the space agency had planned to dock the capsule to the space station for about a week before Hurley and Behnken returned to Earth. Now it wants to extend that mission so the pair of astronauts can do more work on orbit.

Later this spring, after NASA astronauts Jessica Meir and Drew Morgan return to Earth, only Chris Cassidy will remain on board the station. NASA would like to minimize the time Cassidy remains the lone US astronaut on board the orbiting laboratory, so there is discussion of extending Hurley and Behnken's mission to six weeks, or even three months.

Soyuz has a 200-day limit. Is the maximum time on orbit known for Crew Dragon?

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The NASA requirement is 210 days. This is based on a nominal 180 day crew rotation.

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    $\begingroup$ This doesn't really answer the question. OP did not ask what is the contractual minimum requried by NASA, they asked how much Crew Dragon can stay at the ISS which is independent of any paperwork done by NASA it's a measure of how it deteriorates with time. Is there any information about that? $\endgroup$
    – Giacomo Alzetta
    Feb 12, 2020 at 8:03
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    $\begingroup$ @GiacomoAlzetta but doesn't the CD have to meet NASA's contractual requirements? $\endgroup$
    – RonJohn
    Feb 12, 2020 at 14:25
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    $\begingroup$ I don't think there can be a better answer. Dragon is rated & presumably tested to ensure it can be docked for 210 days. While it may be capable of more, nobody is going to go ahead and prove that. $\endgroup$
    – Maaark
    Feb 12, 2020 at 14:29
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    $\begingroup$ Paperwork is everything in space. A new limit would need new paperwork. $\endgroup$
    – SE - stop firing the good guys
    Feb 12, 2020 at 16:24
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    $\begingroup$ I think the point being made is that the Dragon might be able to stay longer than required. If so, how much longer? a year? I remember there is a reason the soyuz is limited to 200 days and that had to do with the storability of some compound on board, hypergolic fuel or something. But I couldn't find the reference. Maybe this question could be addressed by asking what compounds are on the Crew Dragon, and what are their shelf lifes? $\endgroup$
    – Johnny Robinson
    Feb 13, 2020 at 5:15

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