INTERNET should block after user time limit exceeds

My kid listen to lots of unrestricted Youtube, inspite of restricting 1 hour per day on internet.

Found that she opens multiple window with list of audio.

Once the 1 hour permitted time is over, the computer locks-up. 

Though user locked, the background internet continue to work, enabling her to listen. In between she is able to login briefly and switch to different audio. 

ALL I WANT IS :: NORTON FAMILY SHOULD STOP INTERNET PORT ONCE TIME LIMIT EXCEEDS.