Karachi is 3 hours behind Shenzhen
Best overlap: 11:00 AM to 6:00 PM in Shenzhen is 8:00 AM to 3:00 PM in Karachi.
The sweet spot is 11:00 AM to 6:00 PM Shenzhen time, matching 8:00 AM to 3:00 PM in Karachi. Even with Karachi behind by 3 hours, your workdays overlap by a comfortable 7 hours — plenty of flexibility for both sides.