The basic answer is—pretty fast, but not immediately.
This paper compares 9 metals (lead kills slightly better than copper but that unfortunately extends to the humans; zinc and some other metals also kill pretty well, only two did not). Within an hour, copper dropped CFU from 10^6->10^1 (the measurement threshold). Zinc took 2 hours, nickel 4.
The basic answer is—pretty fast, but not immediately.
This paper compares 9 metals (lead kills slightly better than copper but that unfortunately extends to the humans; zinc and some other metals also kill pretty well, only two did not). Within an hour, copper dropped CFU from 10^6->10^1 (the measurement threshold). Zinc took 2 hours, nickel 4.
(this research actually done by Connor Flexman)
That paper only looks at bacteria and does not knowably carry over to viruses.