Quote:

That honour goes to cosmonaut Valery Polyakov, who lived on the Mir space station for 438 days in 1994-1995.


He stayed in LEO, well within the magnetosphere. Transit to Mars will be exposed to any CMEs that happen and will require a heavily (in all ways) shielded retreat. Picture all six in a phone booth for several days...

Quote:

These involved volunteers lying on a bed with the head of the bed tilted six degrees below horizontal for a period of 90 days, to replicate weightlessness.


You could get the results they'll see by studying the average American couch potato. Weightlessness is something else entirely.
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"If they can't picture me with a knife, forcing them to strip in an alley, I don't want any part of it. It's humiliating." - windsock