5 days on fomites and possibly longer is all I have seen for CoVid 19 survival. But on paper its supposedly less. You might try putting a humidity lowering packet in there and seal it. Could get by with a week then I guess. But might as well worry about bacteria too. We will see many secondary bacterials due to pnuemonia.
Geez, just found my online delivery package shipped out of WA in the mailbox with all the other mail. Sprayed straight bleach over everything and my hands and left it outside. Washed my hands with the hottest tap water. Sprayed my hands again and wiped the spray bottle. Rinsed and repeated.
I order something online maybe once every 3 years and of course this just had to come from WA.