Infection with a new coronavirus can develop into novel coronavirus pneumonia in as little as 1 day and as long as 24 days. The usual time frame should be within 14 days, with most people presenting within 3-7 days. There is a process by which a person develops the disease after being infected with a novel coronavirus in the body, and this process is called the incubation period. If the number of viruses is large enough and the virulence is very strong, it is likely that the disease will start in one day, but if the virulence is not particularly strong and the number is average, the body will fight with the virus for a long time. If the virus has the upper hand, the clinical symptoms of infection with the new coronavirus pneumonia will appear.