Best way to pace oneself on the study books?

I pace myself on aan hour-of-study basis. I dedicate some time for GMAT study per week, usually 10-12 hours and than try to study fo 1,5 - 2 hours every day. If I need 5 hours to pass through 2 pages, I dedicate 5 hours to that. On the other hand, if I need 2 hours for 30 pages, I do them in two hours. Different topics and concepts carry different weights and deserve different levels of the attention.

I used similar strategy for CFA and it proved successful for me. I've never cared how much pages I covered but how many hours have I studied. I still have a notebook where I evidenced number of hours I've spent studying for CFA. That way, I was able to almost skip through some chapters I was proficient in, or, on the other hand, to spend even couple of hours per page on some concepts I've found tedious and ridiculously difficult for me.

Nevertheless, some friends of mine, who have also taken CFA exams, told me that this strategy was very tough for them. They just wanted to be sure how many pages they covered each day, noy how many hours they spent studying.