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Non-fiction: If I have to put it away before finishing the first 50 pages because I'm getting triggered, then it's worth picking up again. If I don't get triggered within 50 pages, I put it down and never touch it again.
Fiction: I know after 1 page whether I'm going to continue reading it. I often read all books from a single author in a binge because it's safe and I don't have to go through the trouble of finding new stuff to read that way.

I buy all my books, so it feels kind of wasteful if I make a bad choice - I currently read a little under 100 books per year.
With just one page, can you decide if you want to read it in full? Your criteria are strict.
I've thought about creating a fictional universe, who hasn't, but this kind of criteria keeps me from spending time trying. And thinking about it, if it's really what I want to do, I'll do it regardless of the readers' criteria, even though this is extremely important.
Are you the type who keeps, donates, or sells books when you're done reading them?
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With just one page, can you decide if you want to read it in full?
For fiction yes, because I need the writing style to not annoy me. I have no other criteria for fiction (other than genre of course.)
Are you the type who keeps [..]
Keep/donate. Never sell.
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