Reykjavik is 6 hours ahead of Mexico City
Best overlap: 8:00 AM to 12:00 PM in Mexico City is 2:00 PM to 6:00 PM in Reykjavik.
Keep meetings inside 8:00 AM to 12:00 PM in Mexico City — that maps to 2:00 PM to 6:00 PM in Reykjavik. Reykjavik is 6 hours ahead of Mexico City, leaving about 4 hours of daily overlap — enough for most meetings if you don't leave them too late in the day.