How many hours of watching TV or PC is enough?!

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Neither will hurt your eyes if this is what you are thinking although a PC will tend to strain them more.
As for which is better - depends what you want to end up with at the end of time and what you do on either.

That's a great question. I think about it too, and who really knows? I suppose its different for everyone. I mean for instance, I'm older and retired. Spending too much time on the PC doesn't get in the way of homework haha. By the way I killed my TV 25 years ago, and only wish I'd done it sooner. Although in the "old days" I think it may have been better. Who knows? But I suppose the answer to your question would be is one's PC/TV time taking away from other "valuable" interests or responsibilites. For instance even for me--I can do pretty much what I want--since I no longer work a job or go to school etc--I still need to get my sleep etc. And if I stay up too late or whatever then that's not good. Or if I ignore my household maintenance/or exercise needs etc/or have zero real world interaction with people I guess I think that might not be good. In general I think a lot of good can come through "interaction" on the PC, and I think TV is too passive to be good.

Just my own experience.

ecxact same thing as i do... im not realy on the TV. but pv, im on alot.
Dont be on ALL THE TIME, at least do laundry, do something so computers not addicting you. You can get bad headaces, and my friend said, if your too lazy on the pc all the time; you can end up with a Tumar, so be carefull... just saying. So about 2- 3 hours a day on one of them a day, i dont like tv, it hurts my eyes, as much as the pc does sometimes too. I get headaces often,:(

I know headaces come from too much TV and PC...

How many hours is enough or too much? Depends on who is using the computer or watching the TV. It's not going to "hurt" your eyes looking at a monitor or watching TV. But not blinking enough,while staring at either, will tend to give a person a nice case of dry eyes.

Anyone that takes breaks during their PC and TV watching, changes focus often enough to avoid eye strain, will fare much better than people that don't in most cases.

Maybe 2 or 3 hours on each.