I use Mortimer's system for non-fiction works, which is where it makes the most sense. I would also use it if I was doing a really deep dive in a fiction work.

I use Mortimer's system for non-fiction works, which is where it makes the most sense. I would also use it if I was doing a really deep dive in a fiction work. For most fiction that I am reading for entertainment, the first 50ish pages will tell me if its worth finishing.