I think there's been news floating around that the virus incubation period could be longer, which is probably where the OP got that number from. See here: https

I think there's been news floating around that the virus incubation period could be longer, which is probably where the OP got that number from. See here: https://www.reuters.com/article/us-china-health-incubation/coronavirus-incubation-could-be-as-long-as-27-days-chinese-provincial-government-says-idUSKCN20G06W https://www.reuters.com/article/us-china-health-incubation/c... I don't see that supported by the CDC either though