Riyadh is 5 hours behind Shenzhen
Best overlap: 1:00 PM to 6:00 PM in Shenzhen is 8:00 AM to 1:00 PM in Riyadh.
Your shared working hours run 1:00 PM to 6:00 PM in Shenzhen (8:00 AM to 1:00 PM in Riyadh). Riyadh is 5 hours behind Shenzhen. That leaves about 5 hours of common time — enough for a meeting or two, so use it deliberately.