Adelaide is 12.5 hours ahead of Rio de Janeiro
There is no standard 8-to-6 overlap. Someone joins early or late.
Adelaide is 12.5 hours ahead of Rio de Janeiro, so their typical working days don't line up at all. Plan on one side joining outside normal hours. A recurring slot that trades off between early mornings and late evenings usually works best. The window above shifts seasonally: Adelaide keeps daylight saving while Rio de Janeiro ignores it.