Here's the stat, according to the article: "Preschoolers aged 2 to 5 spend an average of more than 32 hours in front of a TV screen each week, according to Nielsen."
That's more than four hours per day.
The article went on to say that the various preschool stations, Nickelodeon and Disney among them, are trying to accommodate parents' wishes for what they want for their children. When polled five to 10 years ago, parents said they wanted preschoolers to be intellectually stimulated. Now, they say the number one thing they want is for kids to be happy.