It is very easy to read them on my e-ink reader, because my reader (and all readers out there that I know of) remembers the position where I was last time I opened the book. So even if you read just a few pages here and there you are never wasting time looking for the place where you left the book.
I tend to read quite a lot non-fiction books, usually popular science types (not history, not biography, with a few exceptions). Those non-fiction books I read either because I need to learn something for work or other reason, and that motivates me to finish, or books I choose because the topic interests me. If I have to force myself through a book from a second category I usually abandon the book or simply leave it on my reader, perhaps some other time I will be in a mood to read that. The reader keeps my place in a book for an unlimited time.
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