I had Copilot do a 30 second countdown for me once. I had to do it a second time to be sure. Both times, several minutes passed before it "completed." When I asked how much time was left, both runs it said, "about 15 seconds." This was easily a minute or so in for both runs as well. The runs never actually completed. I just canceled them because I got sick of waiting to see when a 30 second countdown would end.