Kyiv is 13 hours ahead of Honolulu

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

Kyiv is 13 hours ahead of Honolulu, which is far enough that a normal 9-to-5 in one city never reaches the other's working hours. One practical option: Honolulu dials in early while it's still late afternoon or evening in Kyiv. Finally, Kyiv observes daylight saving and Honolulu doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.