How long is march madness?

Under the format in use for the 2013 NCAA men's Basketball tournament, "March Madness" consists of the following games:

4 First-round "play-in" games

32 Second-round games

16 Third-round games

8 Sweet 16 games

4 Regional championship games

2 Final Four semi-final games

1 Championship/title game

67 TOTAL GAMES PLAYED

Thus, it is the 67th game that determines the winner.