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There is also a weird, robust mortality relationship where book readers live longer than periodical readers "regardless of gender, health, wealth, or education" [1]. In those studies, the threshold was 30 minutes of book reading a day.

[1] https://pmc.ncbi.nlm.nih.gov/articles/PMC5105607/

While this is just a rule of thumb, I consider moderate exercise, reading, and socializing to be roughly equivalent in positive health benefits. I try to get a little bit of each every day, and then try to have longer sessions of each once or twice a week.

Ten thousand books in an 80-year lifetime would mean finishing one book every three days. That's aggressive, but entirely achievable.

Meh, if the book is bad you fall asleep in 15-30 min. If the book is good you put it down when you finish it and notice it’s morning already. Easy enough.

Talking about fiction read for entertainment of course. HN does tend to assume books are only for learning something.