The working culture in China is really 'unique': rigid and extremely hierarchical (and patriarchal) structures, staff is expected to work overtime.
Just noticed that there is even a Wikipedia article about (but you'd find many other sources on China's '996 working hour system'):
The 996 working hour system (Chinese: 996工作制) is a work schedule practiced illegally by many companies in China. It derives its name from its requirement that employees work from 9:00 am to 9:00 pm, 6 days per week; i.e. 72 hours per week, 12 hours per day. A number of Mainland Chinese internet companies have adopted this system as their official work schedule. Critics argue that the 996 working hour system is a violation of Chinese Labour Law and have called it "modern slavery".
The system is still very widespread, although deemed to be illegal as the article also says.
[Edit typo.]