Brasília 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 Brasília.
If you set up a recurring sync, 8:00 AM to 12:00 PM in Anchorage (2:00 PM to 6:00 PM in Brasília) is the natural home for it. Brasília is 6 hours ahead of Anchorage, which gives you a solid 4-hour window. Book earlier in it and neither side is rushing. Finally, Anchorage observes daylight saving and Brasília doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.