Copenhagen is 6 hours behind Taipei
Best overlap: 2:00 PM to 6:00 PM in Taipei is 8:00 AM to 12:00 PM in Copenhagen.
Both offices are open during 2:00 PM to 6:00 PM Taipei time, which is 8:00 AM to 12:00 PM in Copenhagen. You've got a decent 4-hour window. Set a recurring time near 2:00 PM in Taipei (8:00 AM in Copenhagen) and stick to it. The window above shifts seasonally: Copenhagen keeps daylight saving while Taipei ignores it.