When will copper metal change into iridium?

Answer 1

It cannot without radioactive decay, and it is impractical to imagine copper (element 29) undergoing enough positron emissions to become iridium (element 77). There is no chemistry which can possibly turn copper into iridium, and no known physics either.

Answer 2

Copper metal will not spontaneously change into iridium under normal conditions; they are different elements with distinct properties. The transformation of one element into another usually requires complex processes like nuclear reactions or extreme conditions like those found in a supernova.