Mexico City is 7 hours behind Copenhagen
Best overlap: 3:00 PM to 6:00 PM in Copenhagen is 8:00 AM to 11:00 AM in Mexico City.
If you set up a recurring sync, 3:00 PM to 6:00 PM in Copenhagen (8:00 AM to 11:00 AM in Mexico City) is the natural home for it. Mexico City is 7 hours behind Copenhagen, which gives you a solid 3-hour window. Book earlier in it and neither side is rushing. Finally, Copenhagen observes daylight saving and Mexico City doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.