Rio de Janeiro is 6 hours ahead of Anchorage
Best overlap: 8:00 AM to 12:00 PM in Anchorage is 2:00 PM to 6:00 PM in Rio de Janeiro.
If you set up a recurring sync, 8:00 AM to 12:00 PM in Anchorage (2:00 PM to 6:00 PM in Rio de Janeiro) is the natural home for it. With 4 hours of overlap, 8:00 AM in Anchorage (2:00 PM in Rio de Janeiro) is a comfortable, repeatable slot for both sides. Keep an eye on the calendar — Anchorage observes daylight saving and Rio de Janeiro doesn't, which nudges this window by an hour twice a year.