O friend,it is very wrong to waste all your time only by watching t.v. .Except watching t.v. there were many things that you would have done like reading books or doing something that you like to do like playing outdoor games,skipping,drawing,dancing etc. There should be a limit for everything even for watching t.v. .Everything over its limit is harmful for us.It affects our eyes.It even stops our thinking power. But we get knowledge from news and discovery channels and even relaxation when in a stressed mood.So everything in a limit is good.