Shenzhen is 5 hours ahead of Doha
Best overlap: 8:00 AM to 1:00 PM in Doha is 1:00 PM to 6:00 PM in Shenzhen.
Target 8:00 AM to 1:00 PM in Doha, which lands at 1:00 PM to 6:00 PM for the Shenzhen side. Since Shenzhen is 5 hours ahead of Doha, the workdays overlap by around 5 hours; 8:00 AM in Doha (1:00 PM in Shenzhen) makes a reliable recurring slot.