Best overlap: 8:00 AM to 3:00 PM in Brasília is 11:00 AM to 6:00 PM in London.
Shoot for 8:00 AM to 3:00 PM in Brasília; your London colleagues will see that as 11:00 AM to 6:00 PM. This is one of the easier pairings: 7 hours of shared time means flexible, low-stress scheduling. For part of the year the maths changes: London observes daylight saving, Brasília does not, shifting the overlap by an hour.
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