Finish a book (abandoned for at least a month) that shows up on Goodreads as having at least 400 pages. If your edition doesn't have 400+ pages, please confirm that there is an edition on Goodreads that does. You're on your honor here.
Unabridged audio is fine, but just increasing your e-reader's font size until you get it to show 400 pages isn't.
Unabridged audio is fine, but just increasing your e-reader's font size until you get it to show 400 pages isn't.