I am likely misunderstanding something here, but from that study it looks like Coronaviruses are the most sensitive to UV of any virus they found measurements f

I am likely misunderstanding something here, but from that study it looks like Coronaviruses are the most sensitive to UV of any virus they found measurements for, however because they also have a much larger genome than most they are only the second easiest to deactivate by sunlight. In table 6 they have minutes to a one log decrease in active virus for Filoviridae that is a bit under double the Coronaviridae deactivation in sunlight value (SnS) in Table 2. I'm guessing that value should be linearly comparable that would leave an estimation of about one hour for a one log reduction under the worst conditions they measure in that table (that are all southern US, although the worst value is in April). If I have understood all that correctly, it sounds like a few hours (not minutes) in sunlight should be considered necessary (I'm guessing that would be a few minutes of UV sterilization). Additionally, it seems to me that a mask would not all be equally reachable by sunlight and some parts might not be at all.