That said I recently went for over two months without reading in the evenings - when I resumed reading (a friend literally pushed a book on me and said it needed to be read within a fortnight) I became notably calmer and less stressed.
To have colleagues note that none of the workload had changed yet I was significantly more with it was startling, and the only change I could identify was the book.
For me it's mostly about slowing down.
1. While I'm inside a chapter, I'll keep reading until the end of the chapter.
2. When I'm at the end of a chapter, I will stop if (and only if) I feel that I cannot invest the time to start the next chapter right now.
So short chapters are bad because I will just keep going ("oh come on, only two more pages") and long chapters are bad because I will not even start them. The sweet spot for me was two years ago when I read www.hpmor.com.
1. While inside a chapter, I'll just finish this chapter...
2. At the end of the chapter "oh, I gotta find out what happens. Just one more quick chapter..."