Melbourne is 13 hours ahead of Rio de Janeiro
There is no standard 8-to-6 overlap. Someone joins early or late.
Rio de Janeiro and Melbourne are too far apart in time (13 hours) for their workdays to line up during regular hours. For anything urgent, agree on an early-morning or late-night bridge hour in advance so nobody's caught off guard. Heads up: because Melbourne changes its clocks and Rio de Janeiro doesn't, the difference moves by an hour twice a year. Confirm the overlap around the DST switch.