Thanks to our OverDrive ebook database, you have 24-hour access to a diverse collection of popular titles you can download instantly to your eReader, including the Amazon Kindle and Kindle apps. At the moment, users can have up to four titles checked out at once. The good news is that these eBooks can be returned early when you're finished with them, freeing up a space to your download limit. However, Kindle users may have noticed that Amazon has recently made a subtle change to the manner in which Kindle books are returned early.