The culture will quickly adjust productivity levels back up. This isn't something you need to bother worrying about.
The Chinese government mandates an excessive holiday total; during those holidays, businesses and schools close. But the cultural solution is that schools open and businesses work for however many nearby weekend days the official holiday legally consists of (this irritates expats no end; I'm not quite sure why). So if M-W are a holiday one week, expect to work for the preceding weekend and the saturday after.
"Thus, once or twice a year there would be eight days rather than seven between consecutive Saturdays. Thus the Jewish Sabbath, which must occur every seventh day, would be on a different weekday each year. The same applies to the Christian Sabbath. [British Chief Rabbi] Hertz realised that this would cause problems for Jews and Christians alike in observing their Sabbaths, and mobilised worldwide religious opposition to defeat the proposal."