Dallas is 11 hours behind Dhaka
There is no standard 8-to-6 overlap. Someone joins early or late.
For Dhaka and Dallas, the standard workday in one city falls outside office hours in the other — that's what 11 hours of distance does. Keep live syncs short and infrequent, and let written updates carry the day-to-day between Dhaka and Dallas. The window above shifts seasonally: Dallas keeps daylight saving while Dhaka ignores it.