Mexico City is 3 hours behind Santiago
Best overlap: 11:00 AM to 6:00 PM in Santiago is 8:00 AM to 3:00 PM in Mexico City.
Book within 11:00 AM to 6:00 PM Santiago time (8:00 AM to 3:00 PM in Mexico City) and both teams will be at work. The overlap is wide at 7 hours, so you can protect mornings for deep work and still find plenty of meeting time. Note that Santiago follows daylight saving while Mexico City stays put, so the times above drift by an hour seasonally.