I've always been a voracious reader. I remember when I got my first childrens library ticket, and wanted to borrow a volume of an encyclopedia which I was much taken with. I was most disappointed to be told it was for reference only...
The book I eventually borrowed was read in an afternoon, but I wasn't allowed to go back to the library and swap it for another that day!
I can still consume a new book in a day or so. I recently got Jasper Ffordes new dystopian fantasy "Red Side Story" from the library. That took a day and a half, fitting in other things that needed doing. I'll re-read it again, a bit more slowly, before I return it...