Is there any program that blocks desired website after certain time of its usage. I would like to allow facebook for 2 hour daily to my kid and after that time to block it.
If you go to your local electronics/computer store they should have plenty of software that will allow different access levels for different periods of time that you determine. This can be set on each individual account on a computer as well...
You may not even need software if you use a Router on your connection, on my router anyway there’s options to block certain websites altogether or just block/limit its usage for a certain amount of time to whatever you as the admin set.
Also if you’re using Windows 7 there is a Parental Control feature which may do the job instead.
If not then there are freeware alternatives to Net Nanny.