The normal range of each phase is described in https://patient.info/news-and-features/coronavirus-how-quickly-do-covid-19-symptoms-develop-and-how-long-do-they-

The normal range of each phase is described in https://patient.info/news-and-features/coronavirus-how-quickly-do-covid-19-symptoms-develop-and-how-long-do-they-last https://patient.info/news-and-features/coronavirus-how-quick... The average is 5-6 days to show any symptoms. That is the figure that you are remembering. If it is going to turn severe, the average to develop severe shortness of breath from first symptoms is another 7-10 days. Which means that the range from exposure to severe shortness of breath is 12-16 days...or an average of 14 days. Which is exactly what the person that you were responding to said. So your memory was correct in so far as it went, but you were remembering the wrong fact about COVID-19.