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When will the longest spaceflight of any one person reach 5 years?

The ISS year long mission set out to explore the health effects of long duration spaceflight. Astronaut Scott Kelly and cosmonaut Mikhail Kornienko spent 342 days in space for this mission, checking their health but they were also keeping a journal to write down how they felt. After all, there are more angles to consider than just physical health for these kind of things.

But this wasn't the first mission of its kind. There were three other, longer spaceflights, lasting 365, 379 and 437 days respectively. So we wonder:

When will longest duration anyone has ever been in space surpass 5 years?

Will resolve when the same person has been continuously in space for 5 years or longer.

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Use the community stats to get a better sense of the community consensus (or lack thereof) for this question. Sometimes people have wildly different ideas about the likely outcomes, and sometimes people are in close agreement. There are even times when the community seems very certain of uncertainty, like when everyone agrees that event is only 50% likely to happen.

When you make a prediction, check the community stats to see where you land. If your prediction is an outlier, might there be something you're overlooking that others have seen? Or do you have special insight that others are lacking? Either way, it might be a good idea to join the discussion in the comments.