Single and double rotations take six days off a month. One week and two weeks off means that there are four weeks in a month, the first and third weeks are one week, the second and fourth weeks are two weeks, the first week is one day off, the second week is two days off, and so on. It is a rest system of some enterprises or companies. Rest by rotation is a way of work arrangement. In this mode, employees' rest days are not fixed on Saturday or Sunday, but take turns to rest according to the schedule. This rest mode has strong randomness and variability, in order to meet the special operational needs of some industries, such as retail, catering, medical and other industries, there will be high passenger flow on weekends or holidays, so employees need to rest during off-peak hours.