The longest incubation period for new crowns is usually 14 days, with a very small number of infected individuals exceeding 14 days. The incubation period of novel coronaviruses is usually between 1 and 14 days. According to recent epidemiological observations, the incubation period of most patients is less than one week, usually less than two weeks, and the onset of disease occurs within 3-7 days, although a very small number of infected patients may exceed 14 days. The incubation period varies depending on the strain of the new coronavirus, the patient’s own immunity, and the environment in which he or she lives. For example, many elderly patients have hypertension, diabetes, coronary heart disease and other underlying diseases, so the incubation period of such people will be relatively shorter; for example, if the patient is in an environment with a large number of infected people, facing more strains of the new coronavirus, the risk of infection increases and the incubation period of the infection may also be shortened.