The difficulty with this advice is that many great books start slow, particularly since they were written in times where people had plenty of time spare for rea

The difficulty with this advice is that many great books start slow, particularly since they were written in times where people had plenty of time spare for reading, or they were published in serial form where the author was paid by the word, and so stretched out as far as possible. This doesn't make them any less great, but it does mean that if you filter them because "I'm a little bored 100 pages in", you're losing out on some of the best stuff.