computer use at work, and how many hours do people really work?

[SuzanneD]

So I was talking with an HR professional at my work and she was telling me stories about people who come to work and just goof off. Excessive computer /internet use (which they have spyware to track), playing around and even knitting. I read an article that said people actually only work some ridiculous amount of time like 4 hours a day. What do you all think?