72 14 7 2Etc. How Reliable Are These Numbers ?

[Canary42]

Virus survives on surfaces up to 72 hours
Living with infected person - self-isolate for 14 days
Infected - on recovery self-isolate for 7 days
Stay 2 meters from anyone else

... and so on.

Obviously some of these are a bit arbitrary (e.g. 72hours = 3 days) but today I read somewhere (link below) that virus survival in air is longer than originally thought.

My point is, how are these figures derived, and are they tested rigorously/scientifically ? Probably not, so they're just guesswork made to appear like wise advice because the Establishment don't want us to realise how in the dark they are.




https://uk.yahoo.com/news/coronavirus-3d-model-reveals-covid-19-spread-supermarket-031200781.html

[douglas9401]

We need some kind of measurement to work with, if it turns out 'they' are wrong then another set of figures can replace them.