That's absolutely staggering to me. It also makes me wonder how many people do what my family did growing up, where people get home, turn on the TV, and it runs until everyone goes to bed. I can't think of anything less interesting to do, but apparently I'm a minority.
Our habits are pretty lean. We'll watch the world news if we think to turn it on, and maybe two hours of DVR'd stuff after that (assuming it's not summer, when nothing is on). We might do this three days out of the week, so our actual per-day viewing is probably more in the one hour range, if that.
I think if I did five times that, I'd weigh 300 pounds and shoot myself out of boredom.