Software to restrict time on the iMac?

My kids fight over the iMac - is there any software available that will limit there accounts to a certain amount of time each day, so once they've used their alloted time allowance they have to log off?
Thanks.

Hi,
What about using a chess clock. This can be a solution if two kids are fighting for the same Mac.
A chess clock has two connected time displays, linked in such a way that only one clock can run. When one of the clocks is stopped the other starts.
The clock runs for the player who is on the move. A player makes a move then stops the running clock, automatically starting the opponent's clock. Unless the move has ended the game, the move is not completed until the clock has been stopped.
A chess clock can be used to control access to any scarce shared resource. Two children can peaceably share a computer with the help of a chess clock.
The application to chess is that all moves must be made within a given time limit. A player who has not made the required number of moves loses the game on time.
[i>
/rob
 iMac 20", C2D 2.16GHz   Mac OS X (10.4.10)   RAM 2 GB, VRAM 256MB, 2:nd Monitor, Ext DVD & FW drive, USB sound

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