How would i get about to restricting internet access on a computer hooked up via router to the internet at certain time frames. I'd like to be able to make it so that on weekdays it gets more restrictions. Since i don't get internet through another computer this one would have to block itself. What i was thinking of is using a program as a timer and having it execute a script that would say:
"ifdown wlan0"
And then the start up script would say:
"ifup wlan0"
What would be the easiest way to get this working, so it doesn't interfere with the normal users? Thanks.

I think cron is the timer you are looking for.
man crontab

thanks, found this great link to a manual on using crontab. I'm working on it now.