Vienna is 12 hours ahead of Honolulu

There is no standard 8-to-6 overlap. Someone joins early or late.

A 12-hour difference puts Honolulu and Vienna out of sync — when one team is mid-morning, the other is fast asleep. Consider rotating the inconvenience: one week Honolulu takes the early call, the next week Vienna does. These times hold for most of the year, but Vienna's daylight saving (which Honolulu doesn't use) shifts them by an hour twice annually.