Thirty people at a time. According to the requirements of the Ministry of Health on printing and distributing the Measures for Physical Examination of Employees in Health Promotion Hospitals, the minimum number of physical examinations for employees in health promotion hospitals is 30/time, and regular physical examinations are planned every year 1 person, with no less than 30 people each time. In addition, the physical examination lasts at least 7 days. After three consecutive physical examinations, if the number of physical examinations does not reach 30, the date and method of physical examination may be adjusted with the permission of the health administrative department at the next higher level according to the actual situation.