Coronavirus: USPS employee in Washington state tests positive for virus

[Ms. Toad]

9. Not really.

The average persistence is more like 5 days. The range was 2 hours to 9 days.

https://www.journalofhospitalinfection.com/article/S0195-6701(20)30046-3/fulltext#sec3.1

There's a chart in the middle of the page - they seem to be basing the results on tests of HCoV-229E (not the specific coronavirus involved here, but the same family), in combination wtih SARS-CoV adn MERS-CoV.

Of the 13 surfaces tested, only 5 surfaces were generally safe within 8 hours or fewer. 9 days is longer than average (plastic), but the average is days (~5) not a few hours.