Blitz games will have 1-5 minutes per side.

Most tournaments will have 1-3 hours per side.  A popular setup is 1-2 hours per side for the first 40 moves, plus an additional ½-1 hours each after the 40th move.  They may also allow [Bronstein/Fischer time](http://en.wikipedia.org/wiki/Time_control#Compensation_.28delay_methods.29), if the clock supports it.

The [official FIDE time settings](http://www.fide.com/fide/handbook.html?id=39&view=category) are 90 minutes for the first 40 moves + 30 minutes after move 40 + 30 seconds for every move.

The [2010 world championship](http://en.wikipedia.org/wiki/World_Chess_Championship_2010#Match_conditions) was "120 minutes, with 60 minutes added after move 40, 15 minutes added after move 60, and 30 additional seconds per move starting from move 61."  
I've heard of World Championships going up to 8-hours per side, though.