NotSpaghetti
sazzl - on hard surfaces like ceramic, stainless steel, and plastic, norovirus can remain infectious for up to 2 weeks. It won't just be on the mug, it will be everywhere that hasn't been baked or bleached, or in a dishwasher on a "hot" cycle (ie over 60⁰).
There is a big difference between a viral particle being alive on a surface and being viable. A virus does not remain on the surface, fit and ready to go for a fortnight and on midnight on the 14th day turn up its tiny toes and expire, like any other living thing left on a hard surface without sustenance for 2 weeks it gradually weakens and dies and in the weakening period its capacity to infect declines.
Again it can remain infectious for 2 weeks. That is the absolute extreme, the vast majority of viral particles die well before then. Only the very very hardiest is likely to survive a fortnight and bounce up and infect someone, unless they too are very severely immune compromised.
Yes, individuals that are immune compromised must be careful, and so must places, like hospitals and medical facilities but we do need to keep a sense of proportion and consider the probabilities.
Later this morning, when I go shopping I cross the road outside my home, a car could appear from nowhere driving too fast, and knock me over and kill me. Unlikely but possible. The same applies to these extreme events, when one viral particle remains alive and after 13 days 23 hours 59 minutes and 59 seconds is touched by someone, immediately revitalises and goes on to make them ill, still more unlikely kill or severe disable them.
By the way, no one seems to have mentioned those who cannot wear masks. DH has breathing difficulties without a mask. Wearing a mask is impossible as they make his breathing even more difficult.