Are infected people sick from the novel coronavirus carriers beyond 14 days, much longer or only for few days?

COVID-19 duration: Among persons sufficiently ill to be hospitalized -- as reported from China -- COVID-19 lasts 2-3 weeks, sometimes longer. It may clear more quickly in others not so ill; stay tuned for more data.

Harvard Health says:: "Most people with coronavirus who have symptoms will no longer be contagious by 10 days after symptoms resolve. People who test positive for the virus but never develop symptoms over the following 10 days after testing are probably no longer contagious, but again there are documented exceptions. So some experts are still recommending 14 days of isolation." REF: https://www.health.harvard.edu/dise