Oslo is 5 hours ahead of Rio de Janeiro
Best overlap: 8:00 AM to 1:00 PM in Rio de Janeiro is 1:00 PM to 6:00 PM in Oslo.
The best time to meet is 8:00 AM to 1:00 PM in Rio de Janeiro, which is 1:00 PM to 6:00 PM in Oslo. The shared window is roughly 5 hours; treat its midpoint as the default and you'll keep both teams happy. A quick caveat — Oslo's clocks move for daylight saving and Rio de Janeiro's don't, so the times here are right for only part of the year.