I hate to admit it but my wife and I have almost 2000 books. Most are paperbacks and I had to build a special book shelf in our basement that is designed to hold only that size books and is 8 feet wide, floor to ceiling. I think that on the shelf there are more than 600. Now we both read Kindles. I have a Nook also that has 65 books on it. Kindle Unlimited helps a lot with the newer books and authors. I still like the feel of a real book but I'm running out of room.