Geneva is 7 hours behind Shenzhen
Best overlap: 3:00 PM to 6:00 PM in Shenzhen is 8:00 AM to 11:00 AM in Geneva.
For the smoothest call, aim inside 3:00 PM to 6:00 PM in Shenzhen, i.e. 8:00 AM to 11:00 AM in Geneva. Since Geneva is 7 hours behind Shenzhen, the workdays overlap by around 3 hours; 3:00 PM in Shenzhen (8:00 AM in Geneva) makes a reliable recurring slot. Seasonal note: Geneva uses daylight saving and Shenzhen doesn't, so double-check the times in your own months — they can move by an hour.