„According to the OECD, fifteen-year-old pupils from Shanghai spend on average 13.8 hours per week doing homework, and many attend ‚cram‘ schools on top of that. These schools offer afternoon sessions, which start after the end of regular classes and continue late into the evening.“
Univ.-Prof. Dr. Matthias Doepke u. a., „Love, Money and Parenting“ (2019), S. 288