Shenzhen is 7 hours ahead of Copenhagen
Best overlap: 8:00 AM to 11:00 AM in Copenhagen is 3:00 PM to 6:00 PM in Shenzhen.
If you set up a recurring sync, 8:00 AM to 11:00 AM in Copenhagen (3:00 PM to 6:00 PM in Shenzhen) is the natural home for it. You share roughly 3 hours a day. That's enough for regular meetings, but treat the window as prime time and guard it. Finally, Copenhagen observes daylight saving and Shenzhen doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.