I think I am going to note that down, it’s just a great line (insert obligatory imho, ymmv here)!
WarlokElf,
My uneducated guess is that a moderate amount of time watching TV is good for your intellegence. However a great deal hinges on the actual content. As far as the pure physical process goes(i.e eye coordination, interpretation of signals etc.)
I would believe that a few minutes would be enough. However, watching more would only be good for you if it offered you an opportunity to think.