 The incubation period for COVID-19 is estimated to be between 214 days and 5 days, with a mean of approximately 5 days. The average time from illness onset to hospitalization or isolation is estimated to be 34 days without truncation and 59 days with truncation. Additionally, the median time delay from illness onset to death is estimated to be 13 days, with a maximum of 17 days if the right tail is truncated. These findings suggest that the recommended quarantine duration should be at least 14 days. This article was authored by Natalie M. Linton, Tatsuro Kobayashi, Ichiyang, and others.