Apparently 9 days on hard surfaces (glass, metal, plastic) is not uncommon for coronaviruses. No idea where the tale about only nine hours came from - just more of the avalanche of bullsh*t that has been generated by incompetent 'health professionals'.
You may have heard of the somewhat painstaking Chinese study where they had video footage inside a bus and were able to trace the passengers. Only one person on the bus had COVID-19. Another person sitting 4.5 meters in front of them became infected. 30 minutes after the carrier got off, another person got on a different part of the bus and became infected - surface transmission didn't come into play anywhere.
In other words, despite public bleating that it's just like flu, SARS-CoV-2 can be aerosolized and is more like Measles in terms of airborne contagion.
This
research article cites 3 hours in the air and 2-3 days on plastic and stainless steel.