There is no standard 8-to-6 overlap. Someone joins early or late.
Given Hamburg is 10 hours behind Sydney, the realistic answer is that there's no convenient shared slot during normal business hours. Catch the edges of the day: the last hour for Sydney or the first hour for Hamburg is usually the least painful option.
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Sydney Australia/Sydney | ||||||||||||||||||||||||
Hamburg Europe/Berlin |
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