How many times a month do convenience bees work night shifts?

According to the recruitment requirements of convenience bees, there are two shifts at night and the night shift is about one month 15 days.

Working at night shift and turning day and night upside down will lead to endocrine disorders. Go to night shift, because lack of sleep will affect the immune system, leading to decreased immunity. Moreover, the night shift disrupts the normal biological clock of the human body, but it works while sleeping. Melatonin, which can inhibit tumor production in the human body, is usually secreted at night. Light will inhibit melatonin secretion, and too low melatonin level will increase the risk of cancer.