Big Book Series That Won't Be Finished Until You're Middle-Aged
These are popular book series that have taken a long time to be written and are, as of the making of this list, still unfinished. There's a good chance that when they are finally finished (if ever), you'll be much older than you are now.
avg. score: 4 of 23 (19%)
required scores: 1, 2, 3, 5, 8