Visit this link. The website provides a link to show daily routines of some of creative people. Green indicates working time, white is sleeping time and blue and orange is other things like social activities. What you can actually find is that everyone works differently. Some people obviously over worked and some people only worked 2 hours a day. This shows that working many hours does not indicate the quality of work.
What I found interesting is that people need to find their best working routines to work productively. This also leads back to my previous tips, "have social time" and "take enough rest and sleep".
Enjoy studying!
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