I definately agree about the breaks. For myself, I've found that I can most effectively retain textbook material if I allow myself about 1/3 of the time to let my brain 'catch up,' so to speak. It definately helps me think about whats currently going on, and how it connects to what I read a few pages back etc.
I usually go for 20 mins, 10 min break, or 30/15. Any longer, and it becomes increasingly difficult for me. Some physical activity, such as stretches or walking about help me sort out my mental filing drawer.
I hope this helps!
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