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Note that the "9 days" thing is based on assumptions with other coronaviruses. And even that, that's a "best case scenario". The virus is actually quite easy to clean, which is why you saw them spraying the streets in China. Disinfection would obviously be part of the procedure, and would effectively wipe out the possibility of surface contamination.
Asymptomatic people who eventually get sick, I think the timeline on that is like 2-3 days, though it's been a while since I read that and it could have been updated since then.
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