If you have young children at home who spend too much time on computer, you may want to put some sort of restriction on the usage.
Timekpr-nExt enables you to limit computer usage for certain accounts based on the time of day, number of hours a day, week or month. You may also set time interval to force the account user to take break.
See Got Kids? Limit Computer Usage Per Account in Linux With Timekpr-nExt - It's FOSS
Timekpr-nExt lets you limit the computer usage on a Linux system. A handy utility for parents who do not want children to spend excessive time on the computer.