What is the longest shift for doctoral students in Maoming Petrochemical Company?

12 hour. According to the official recruitment information of Maoming Petrochemical Company, the shift system of doctoral students in this company is two shifts or three shifts, with the working time of each shift being 12 hours and the rest time being 1-2 days, generally once a month or once a quarter. Therefore, the longest shift of doctoral students is 12 hours.