Best overlap: 11:00 AM to 6:00 PM in Edinburgh is 8:00 AM to 3:00 PM in Brasília.
If you set up a recurring sync, 11:00 AM to 6:00 PM in Edinburgh (8:00 AM to 3:00 PM in Brasília) is the natural home for it. Brasília is 3 hours behind Edinburgh, 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. Because Edinburgh and Brasília don't both observe daylight saving, plan to re-check the overlap around March and November.
London to New York is five hours apart, except for the five weeks a year when it isn't. Exact overlap windows for every US zone, the 2026 DST mismatch dates, and where to put the recurring sync. -