I speed up the books, I’m a 1.75x guy, so I can power though most books I may have stopped reading if it had been a real book that I just couldn’t get into.
I’ve done the Harry Potter series, Dark Tower, Wheel of Time, Shakespeare, James Reece (Terminal List), Mistborn, James Clavell’s Asian saga, etc.
I’m thinking of starting the 20+ book series of Master & Commander next.
I think I’ve only ever bought 3-4 books not on my monthly credit in the 8 years I’ve been subscribing.