Flowing Data has an excellent set of interactive graphs showing how Americans spend their day. It’s an interesting look into modern American culture.
Main takeaway: we spend most of our time sleeping, eating, working, and watching television.
— Yau, 2011: How do Americans spend their days?
I particularly like comparing the 15-19 adolescents to adults (more time in education and less time watching television; there’s also a different sleeping pattern).