https://www.msn.com/en-us/health/other/study-coronavirus-can-persist-in-air-for-hours-and-on-surfaces-for-days/ar-BB11jSTc?ocid=msedgntp
The tests show that when the virus is carried by the droplets released when someone coughs or sneezes, it remains viable, or able to still infect people, in aerosols for at least three hours.
On plastic and stainless steel, viable virus could be detected after three days. On cardboard, the virus was not viable after 24 hours. On copper, it took 4 hours for the virus to become inactivated.