There is no standard 8-to-6 overlap. Someone joins early or late.
There's no shared 9-to-5 between Rio de Janeiro and Tokyo; at 12 hours apart, one city's workday is the other's evening or night. Your best bet is one team taking an early-morning or late-evening call — alternating who stretches keeps it fair over time.
| Local time | 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Rio de Janeiro America/Sao Paulo | ||||||||||||||||||||||||
Tokyo Asia/Tokyo |
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