Up to 24 hours on cardboard according to
here.
Quote:
Neeltje van Doremalen, a virologist at the US National Institutes of Health (NIH), and her colleagues at the Rocky Mountain Laboratories in Hamilton, Montana, have done some of the first tests of how long Sars-CoV-2 can last for on different surfaces. Their study, which has been published in the New England Journal of Medicine, shows that the virus could survive in droplets for up to three hours after being coughed out into the air. Fine droplets between 1-5 micrometres in size – about 30 times smaller than the width of a human hair – can remain airborne for several hours in still air.
It means that the virus circulating in unfiltered air conditioning systems will only persist for a couple of hours at the most, especially as aerosol droplets tend to settle on surfaces faster in disturbed air.
But the NIH study found that the Sars-CoV-2 virus survives for longer on cardboard – up to 24 hours – and up to 2-3 days on plastic and stainless-steel surfaces. (Learn how to clean your mobile phone properly.)
The findings suggest the virus might last this long on door handles, plastic-coated or laminated worktops and other hard surfaces. The researchers did find, however, that copper surfaces tended to kill the virus in about four hours.
|
Haven't seen anything to indicate whether it's any different for paper. Some types of paper such as a glossy magazine would be less water-absorptive (and more likely to be coated in a fine layer of plastic) than e.g. the type of paper used for envelopes, so in theory it might last even longer.
As a "high touch" item, any plastic wrapping/bag around a loaf of bread would need to be cleaned before putting it into your breadbin! Thankfully, I make my own bread anyway.
