Coronavirus: USPS employee in Washington state tests positive for virus

[Ms. Toad]

6. The number is 9 days.

I'm at least one of the posters who has been citing that number. Here's one reference to the study: https://www.contagionlive.com/contributor/saskia-v-popescu/2020/02/the-persistence-of-sarscov2-on-inanimate-surfaces

That said, the duration will vary depending on the surface. Some surfaces are better for sustaining virus life than others. I haven't found any specifically discussing how long it lives on paper.