There was a rule a fourth grade teacher of mine had that she used in her English class to try and get some of the less literate kids up to par. That rule was embodied by the name she gave it, "Thirty minutes thirty pages." She gave them thirty minutes to read thirty pages of a book. A minute a page. Considering most of them were choosing things like Goosebumps that were only a hundred and twenty pages or so it was an easy enough ask. But because she set it as a challenge so many of them went blasting beyond that. Many would finish half the book during that thirty minute reading period. The interesting thing I didn't pick up on until years later as an adult was that it was also slow enough that they could actually understand and remember what they were reading rather than just blasting through it. It left the slower readers with enough time and didn't make them feel like they were falling behind while encouraging them to learn how to read faster.

Many modern adult book series are six hundred pages or more for a single installment with about four hundred words a page versus the maybe hundred and fifty of a children's book like Goosebumps. Since it's three to four times the text that makes thirty pages thirty minutes actually viable as a self challenge even as an adult.