First, let me quote a passage from Fast Food Nation that inspired me to write this article:
"The typical American child now spends about twenty-one hours a week watching television - roughly one and a half months of TV every year. That does not include the time children spend in front of a screen watching videos, playing video games, or using the computer. Outside of school, the typical American child spends more time watching television than doing any other activity except sleeping. During the course of a year, he or she watches more than thirty thousand TV commercials. Even the nation's youngest children are watching a great deal of television. About one-quarter of American children between the ages of two and five have a TV in their room."
Page 46 of the 2002 edition by Penguin books.
Twenty-one hours a week, guys. One and a half months, each year, of constant TV watching. And it's old news, too - Schlosser's data come from 2001 (or even earlier), which is AGES ago in our fast-paced world.
Most likely, the situation got only worse by now.
If you're not American, don't get too smug - other nations are just as bad in their TV viewing habits. Likewise, do not think that the problem concerns children only - adults (who are supposed to be wiser!) are just as screen-eager as their kids.
Precise statistics are difficult to come by online, but have a look here or here or here for more information.