I had a problem when I start reading pdf books, I was very excited to start reading a new book and try to discover it and take down notes as possible as I can and that have led me to read more than 15 pages per day and some days none, but now I also try to use the same tips that you are using (read only 10 pages every day at noon and stop after)...
I have heard of a tip related to work or study overall that we should stop working when we want to do a bit more of it for better productivity in the long term and avoiding burnout. The consistency is also really important, so limiting the number of pages but doing it regularly makes sense!
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