There is no standard 8-to-6 overlap. Someone joins early or late.
Given Helsinki is 10 hours ahead of San Francisco, 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 Helsinki or the first hour for San Francisco 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
San Francisco America/Los Angeles | ||||||||||||||||||||||||
Helsinki Europe/Helsinki |
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