Reykjavik is 3 hours ahead of Rio de Janeiro
Best overlap: 8:00 AM to 3:00 PM in Rio de Janeiro is 11:00 AM to 6:00 PM in Reykjavik.
Schedule calls for 8:00 AM to 3:00 PM in Rio de Janeiro — your colleagues in Reykjavik will be online from 11:00 AM to 6:00 PM. Despite the 3-hour difference, a 7-hour overlap keeps things simple and gives both teams breathing room.