Warsaw is 12 hours ahead of Honolulu

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

Warsaw is 12 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 Warsaw. These times hold for most of the year, but Warsaw's daylight saving (which Honolulu doesn't use) shifts them by an hour twice annually.