This picture below, means I've sat and watched a youtube video for over an hour, without even realising. Dayum.
I do agree that it's not productive and whatnot, but I'm even more curious on how you can watch an hour long video without moving. I usually would need to sit two hours for the vid to load, pause it to get water or food. More importantly, I want your fast Net connection.
That's not big deal, I've watched many two hour podcasts. There are people who watch videos longer than that; they're scary.