Blocking access to the net after X time & sites

Hi all, i'm currently setting up a network in a childhood house. I've configured an internet gateway running linux debian. My 2 questions are : how can i disallow access after e.g. 30 hours of connection to the net. (but by prompting a password, the access will be granted) & how can i disallow the

Blocking access to the net after X time & sites

Hi all, i'm currently setting up a network in a childhood house. I've configured an internet gateway running linux debian. My 2 questions are : how can i disallow access after e.g. 30 hours of connection to the net. (but by prompting a password, the access will be granted) & how can i disallow the