One book at a time? Or more than one? If more, are they different types/genres? Or similar?
(We’re talking recreational reading, here—books for work or school don’t really count since they’re not optional.)
Definitely more than one at a time. I generally have a couple of fiction books going at once, although often in different genres (general fiction vs. science fiction, for example), as well as one or two nonfiction ones. I like to be able to pick up whatever I'm in the mood for at the time. As long as I don't wait too long before picking up a book I left in the middle I don't have trouble picking up where I left off. And sometimes, sadly, I just abandon a book halfway.