I take my time when playing games... I mean, some games of mine have more than three years and I'm still playing through them!
Legend of Zelda: Ocarina of Time is like... my second fastest time! I've acquired the cart the 25 of April of 2009, and I've beaten the game the 8 of july of 2009.
I think my fatest time is Mischief Makers: although I still have to beat it, I'm on Cerberus B and I have this game sicne the 14 of July of this year (2011).
I think my third fastest times are Paper Mario and Mega Man 3 (five months).
Why beat a game in 6 hours if there is so much to appreciate?