I can't give a good answer but I'm quite certain no game has gone over 400. But I have heard of games reaching 150-200.
Question Time - Most Moves?
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If Google, Wikipedia or Kurt Godden were registered members here, they might know ...
The longest Chess game is 269 moves (I. Nikolic - Arsovic, Belgrade 1989) which ended in a draw.
http://blog.chess.com/kurtgodden/the-longest-possible-chess-game
http://www.chess-poster.com/.../did_you_know.htm
http://www.chessgames.com/perl/chesscollection?cid=1002889
with so many players on line we might get some answers to some puzling questions.
mine is whats the most number of moves recordered in a chess game?