I am activating a Psychology Textbook. I usually created mind maps during the reading. That decreased my speed dramatically. I can spend up to 4 hours per chapter. (about 40 pages a lot of definitions).
I will do this new way:
1) Set a specific time (best 30 minutes I believe).
2)Set a specific number of pages or a point until which you want to get.
3)Activate the information.
4)Spend 5-10 minutes at the end of the "30 minutes block" mind mapping.