What is the latest you have ever returned a library book? I think mine was a whole summer when I was in Jr. High School, because it took that long for me to clean my room and find it.
But one mysterious person that checked a couple of books out of the Portland State University library makes us look like slackers! They just returned books that were checked out in 1963! The books had a note attached and were obviously well used. I think this is less of a case of returning an overdue book, and more of a case of cleaning house and freeing up some shelf space, but the librarians were gracious and just glad the books were returned, eventually.
BTW – That isn’t even the world’s record for overdue books. That would be 288 years in Cambridge, England.
Borrower returns books 52 years late to Portland State University’s library, with unsigned note