Mexico City is 6 hours behind Reykjavik
Best overlap: 2:00 PM to 6:00 PM in Reykjavik is 8:00 AM to 12:00 PM in Mexico City.
Aim for 2:00 PM to 6:00 PM Reykjavik time — that's 8:00 AM to 12:00 PM over in Mexico City. Mexico City is 6 hours behind Reykjavik, which gives you a solid 4-hour window. Book earlier in it and neither side is rushing.