The current epidemiologic investigation found that the incubation period of patients with new coronavirus infection is mainly 1-14 days, the longest 14 days, most patients are 3-7 days. However, some time ago it was also reported that the incubation period of some patients in the study of more than 1,000 patients reached 24 days. The longer the incubation period of the patients, the longer the infectious time, and the more difficult to manage the patients, so the isolation of 14 days is enough to be a matter of concern for everyone. However, most clinical patients develop the disease within two weeks, and there may be a few cases in which the patient carries the virus for more than 14 days or even 20 days. Recently, there are also reports and studies that found that the incubation period of the patient is more than 24 days, or up to 29 days, but these are a few cases, and the majority of cases have an incubation period of less than two weeks. Source: Dr. Yurai