It's not unusual for someone to spend 100 hours on a chapter. When you consider that sometimes whole semesters are devoted to part of the material of a textbook.
It always depends on your purpose. If you want to apply the knowledge you will activate and research more.
If it looked like you were going to spend 3 hours plus to skitter 100 pages I'd have stopped you at least 9 times and asked you what your purpose was. So you check in whith your purpose. Also I would have challenged you to start from the middle of the chapter not at the beginning. Returned you to focusing on getting what you need from the book in the order it relates to you and the knowledge you already have.
It's a mistake to think you have to read and understand everything the author is saying the first time through. Build in layers build onto your existing knowledge. Authors have no option but to write in some logical order. They may not teach you that way if you were sitting across from them in person. I know I wouldn't. Books are structured in some sort of logical sequence. Another author might write with a difference sequence. That's not to say either author is wrong. It's your job to read for meaning, and build on your knowledge. It's also your job to know if you already know it, to move on. And if you're not getting it, make a note to yourself and move on. The note is a reminder to come back to it on another layer. It's quite probable you could have finished the 100 pages in an hour or less.
Alex
