Hanoi is 11 hours ahead of Atlanta

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

With 11 hours between them, Atlanta and Hanoi have no overlap during standard business hours — by the time one team logs on, the other has logged off. The usual fix is an early start for Atlanta or a late finish for Hanoi — pick whichever team has more flexibility. Bear in mind Atlanta shifts for daylight saving while Hanoi stays fixed — recheck these hours after each clock change.