Geneva is 4 hours ahead of Rio de Janeiro
Best overlap: 8:00 AM to 2:00 PM in Rio de Janeiro is 12:00 PM to 6:00 PM in Geneva.
Keep meetings inside 8:00 AM to 2:00 PM in Rio de Janeiro — that maps to 12:00 PM to 6:00 PM in Geneva. Because you share 6 hours of the workday, there's no need to compromise; book the time that suits the meeting, not the map. Because Geneva and Rio de Janeiro don't both observe daylight saving, plan to re-check the overlap around March and November.