The Time Limits functions in Windows 7 is a tool to control the computer usage limits for the certain user – which is really useful for parents to control their children’s computer usage – so that the kids are sleeping instead of playing games at nights!
Open the Control Panel and look for Parental Controls. Choose a user from the list. You can also create a new account to set up the Parental Controls.
Select On, enforce current settings. To active the Time Limits, click on the Off link.
On this screen, click and drag the hours you want to block or allow. The blue color represents Blocked while white color is Allowed. Press on OK and you are done!