Geneva is 7 hours ahead of Mexico City
Best overlap: 8:00 AM to 11:00 AM in Mexico City is 3:00 PM to 6:00 PM in Geneva.
Keep meetings inside 8:00 AM to 11:00 AM in Mexico City — that maps to 3:00 PM to 6:00 PM in Geneva. With 3 hours of overlap, 8:00 AM in Mexico City (3:00 PM in Geneva) is a comfortable, repeatable slot for both sides. Finally, Geneva 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.