Honolulu is 13 hours behind Athens

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

Honolulu is 13 hours behind Athens, 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 Athens. Keep an eye on the calendar — Athens observes daylight saving and Honolulu doesn't, which nudges this window by an hour twice a year.