„The PISA 2012 report indicates that students in Shanghai spent more time on homework than their peers, spending approximately 13.8 hr a week on homework compared to the OECD average of 4.9 hr.“
Wenjie Yang u. a., „Post-PISA Education Reforms in China: Policy Response Beyond the Digital Governance of PISA“. In: „ECNU Review of Education“, 2019, Vol. 2(3), S. 300