Melbourne is 5 hours ahead of Karachi
Best overlap: 8:00 AM to 1:00 PM in Karachi is 1:00 PM to 6:00 PM in Melbourne.
The sweet spot is 8:00 AM to 1:00 PM Karachi time, matching 1:00 PM to 6:00 PM in Melbourne. Roughly 5 hours of common time means scheduling is manageable; just avoid the very edges of the window. Because only Melbourne changes its clocks, the overlap above isn't fixed; expect a one-hour shift when Melbourne enters or leaves daylight saving.