Romaco Timeout: Free Software to Limit Your Kids Online Time by britec
This is a great piece of freeware from Canuck, Mark Furneaux (a.k.a. TheUbuntuGuy ). It simply does what it says it will. Perhaps the only thing is to make sure that when you install it, that you select the Install for Everyone option. That way you can apply it to whichever users are on the computer.
Romaco Timeout Download: