Shanghai is 6 hours ahead of Copenhagen
Best overlap: 8:00 AM to 12:00 PM in Copenhagen is 2:00 PM to 6:00 PM in Shanghai.
Keep meetings inside 8:00 AM to 12:00 PM in Copenhagen — that maps to 2:00 PM to 6:00 PM in Shanghai. Shanghai is 6 hours ahead of Copenhagen, which gives you a solid 4-hour window. Book earlier in it and neither side is rushing. These times hold for most of the year, but Copenhagen's daylight saving (which Shanghai doesn't use) shifts them by an hour twice annually.