HT0783 - 90-minutes of Media Fun

Last night I felt like reading, so I pulled out my current novel and dove in. It was 7pm. About 8:30 I realized my eyes were tired and so I put down the book and decided to watch a movie. When the movie ended about 10, I went to bed. As I was lying there drifting asleep I tried to remember the last time I spent 90 minutes with either a photograph or, more likely, a book of photographs. Why is it so easy to spend 90 minutes with music or the theater, but that seems unreasonably long for spending time with still photography?