Copenhagen is 4 hours behind Karachi
Best overlap: 12:00 PM to 6:00 PM in Karachi is 8:00 AM to 2:00 PM in Copenhagen.
For a call that suits both sides, look at 12:00 PM to 6:00 PM in Karachi / 8:00 AM to 2:00 PM in Copenhagen. With 6 hours of daily overlap, these two cities are an easy pairing; almost any reasonable hour works. Because Copenhagen and Karachi don't both observe daylight saving, plan to re-check the overlap around March and November.