I never got limits but I got quite addicted to the internet. In my case it was caused by other factors (depression), but I wouldn't discount the possibility in

I never got limits but I got quite addicted to the internet. In my case it was caused by other factors (depression), but I wouldn't discount the possibility in general. I would set the limit at "you have to do something other than school and tv/internet/gaming in your day, on most days."