There's been some discussion on how fast a reader can plow through a novel (nonfiction is a different animal). Some readers are slower than others. Wasn't there someone named Evelyn Wood who advertised to give speed reading classes? I saw her ads on TV at some time. Anyway, my sense is you read as quickly and efficiently as you can while still enjoying the written tale. If a writer's prose style clicks with you, you can pick up the pace a little more. For instance, I read a lot of private eye/noir books, so I know the genre's quirks, slang, and "voice". Not always, but I don't get hung up on the prose, and I can get on with, and enjoy, the story at hand. Of course, good, old skimming and skipping also works if you reach a boring stretch.
I do have to say, though, that I'm not constantly playing around on the Internet, and I don't watch television and very rarely watch DVDs. My "off" time is spent reading. I think this contributes to my being able to read more books than if I was a "Sex in the City" kinda gal! Since my husband works swing shift and isn't home in the evenings, and because my son is grown and doesn't require my attention on a regular basis, I have lots of time to devote to my reading.
Thankfully! Give me a book and I'm happy.