Honolulu is 13 hours behind Kyiv

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

Kyiv and Honolulu live on different parts of the day. With 13 hours between them, standard working hours simply don't meet. Make the most of handoffs — end-of-day in one city becomes start-of-day in the other, so pass work along rather than meeting live. For part of the year the maths changes: Kyiv observes daylight saving, Honolulu does not, shifting the overlap by an hour.