NEJM article published today.
https://www.nejm.org/doi/full/10.1056/NEJMc2004973?query=RP
Viruses were applied to copper, cardboard, stainless steel, and plastic maintained at 21 to 23°C and 40% relative humidity over 7 days.
SARS-CoV-2 was more stable on plastic and stainless steel than on copper and cardboard, and viable virus was detected up to 72 hours after application to these surfaces
Half-lives of the different surfaces summary:
Plastic. 6.8 hours
Stainless Steel. 5.6 hours
Cardboard. (none after 24 hrs)
Copper. (none after 4 hours)
Aerosols. 1.1 hours
All those boxes from UPS, FedEx, and USPS could now be cycled out of their quarantine and handled a day or 2 later !
Note* an important one. That is not the time for the virus to be gone. That is the time it takes to reduce by 50%. It says so plainly in the study.