Honolulu is 12 hours behind Brussels
There is no standard 8-to-6 overlap. Someone joins early or late.
A 12-hour difference puts Brussels and Honolulu out of sync — when one team is mid-morning, the other is fast asleep. Consider rotating the inconvenience: one week Brussels takes the early call, the next week Honolulu does. Because Brussels and Honolulu don't both observe daylight saving, plan to re-check the overlap around March and November.