Reykjavik is 3 hours ahead of Brasília
Best overlap: 8:00 AM to 3:00 PM in Brasília is 11:00 AM to 6:00 PM in Reykjavik.
Aim for 8:00 AM to 3:00 PM Brasília time — that's 11:00 AM to 6:00 PM over in Reykjavik. Reykjavik is 3 hours ahead of Brasília, but you still share a generous 7 hours of overlap, so scheduling is easy and there's room to move a meeting when you need to.