Next is what they're calling the viable virus factor. I think we've all wondered how long is SARS-CoV-2 viable and in what scenarios, and there's a lot of variables, honestly. Here's what they based their model off of:
"Viable virus factor
Viable SARS-CoV-2 was identified in air samples from rooms occupied by COVID-19 patients in the absence of aerosol-generating health-care procedures [116] and in air samples from an infected person’s car [117].
...
While in laboratory experiments, SARS-CoV-2 stayed infectious in the air for up to 3 hours with a half-life of 1·1 hour [119], a systematic review looking at the range of ratio of viral copies in aerosol to plaque forming units (PFU) ratio returned values in between 6 to 0.343 log10 viral copies/litre of air and in between 2.15E+03 to 2.68E+04 TCID50/100 μm for viral titre [116], [120] and RNA to PFU [116] respectively."
I've certainly read numbers longer than 3 hours before, but don't have a reference handy. This might be one variable that I take issue with, but I'm not sure off hand.
I'm right there with you from my memory. In annex 1, Q3, they provide 8 studies and a half life of 1.1 hours came up twice, once in a model and once in an experimental, and were each the largest values there. I'd have to dig further into this one to have a fully formed scientific opinion.
This one's been bugging me all day! So, that paper does exist that we both remember:
https://www.medrxiv.org/content/10.1101/2020.04.13.20063784v1
There's nothing after it, that I found in a quick search, that came anywhere close to 16 hours. I'm considering it an outlier at this point.
I am very much a Professor Jimenez fan(@jljcolorado please come back to Mastodon!) and his paper said that aerosols from speaking can linger for 9 hours.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8349476/
I think a large part of it is the variability across different atmospheric conditions:
https://www.pnas.org/doi/full/10.1073/pnas.2200109119
Perhaps the answer is really just "hours"
@BE Dr Eric Feigal Ding (epidemiologist) posted solid evidence that Covid stays in the air for up to 16 hours.