The longest I've been at sea is 47 days. But that was on a 37' sailboat.
I remember how bummed out I was when I first saw the lights of the Azores and then the Iberian coast. I didn't want to leave the little universe that our boat had become and have to deal with a bunch of random egos, noise, rules, and expectations. I liked my simple little world of air and sea and birds.
"...Depression, odd behavior, eccentricity, extremely nitpicking behavior, aggressiveness and usually accompanies a severe lack of performance" - I felt it all very acutely for an afternoon or two. Then I saw how my 3 other shipmates were all going through the same thing to one degree or another. No one wanted to get back to the beach.
Well, there's only one cure for La Maladie De Bernard - Grog.
A safety meeting was called, and an epic drunk was motioned, debated, and passed by Unanimous Decree.
We stayed hove-to for three days, 220 miles from Gibraltar, while we drank the last gallons of Capitan Morgan, Grand Mariner, Cutty Sark, Skyy, and Lucky Lager we had stashed on the boat. I don't remember much: blasphemies shouted to the wind...Dionysian rites of hubris and sacrificial revelry amid drastic seawater bong hits...The video isn't much help either.
I woke up with a lot of bruises, some minor abrasions, and a brain that had detached from my skull somehow and now sent out waves of pain and dismay whenever I tried to move enough to bungie my eyeballs and tongue from the searing, swirling deck.
Then I realized I had a woodie and that funky smell was land and that the idea of Barcelona in a couple days was actually pretty cool.
http://en.wikipedia.org/wiki/Bernard_Moitessier