Maybe a year or two, maybe ten years. Unless it is a public security inspection law and other units, most units have no system of regular communication. In synchronization with the five-year change of the district government, the district government departments will be re-appointed in five years (including new post adjustment), and generally serve for two terms at most. There is no need to appoint a deputy at the time of change, and the same position needs to be adjusted at most 10 years. Some important positions in charge of people and property also have working hours restrictions.