Not sure how reliable it is but https://www.chinalawblog.com/2017/04/china-overtime-laws-and-employee-terminations.html gives an in depth look and multiple other sources confirm 40 hour work weeks, 8 hour work days, and limited overtime.
Chinese labor laws generally require that work schedules not exceed 8 hours per day or 44 hours per week, with overtime limited to 3 hours per day and 36 hours per month
From https://www.cecc.gov/publications/annual-reports/2019-annual-report
Not sure how reliable it is but https://www.chinalawblog.com/2017/04/china-overtime-laws-and-employee-terminations.html gives an in depth look and multiple other sources confirm 40 hour work weeks, 8 hour work days, and limited overtime.
From https://www.cecc.gov/publications/annual-reports/2019-annual-report