How to Know When It's Time to Quit a Book, According to Avid Readers

"Am I constantly spacing out and thinking of other things? Am I not engaging with the characters? Do I want to know where this story goes or am I good knowing what I know? I regularly read multiple books at a time, but if I get to the point where I really don't think I'll ever pick it up again, I'll just stop and call it quits. It's harder to do with books I own though. I try to read two-thirds of a book I bought." — Anamaria