I do think it's important to take your time to digest non-fiction. Sometimes it takes me a week or two to finish the same amount of pages of fiction I could read in a few days. Fiction is easier to digest, so to speak, because you aren't doing much cognitive processing -- it's like watching a movie. (Unless the book is particularly clever and cerebral.)
With non-fiction, you're actively learning and processing new information; some authors are good at making non-fiction that is more narrative, and that can help present the facts in a gradual way so you're not too overwhelmed. But in general, the best way to go through non-fiction is just to approach it a little bit at a time. This is harder to do on an e-reader admittedly, since at least for me, that lack of progress can be daunting. It's worth it to have a physical non-fiction book that you can turn to when you feel like taking a break from fiction or just feel like getting in the mood for it.
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