Chicago is 11 hours behind Dhaka

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

Chicago is 11 hours behind Dhaka, which is far enough that a normal 9-to-5 in one city never reaches the other's working hours. One practical option: Chicago dials in early while it's still late afternoon or evening in Dhaka. Remember that Chicago shifts for daylight saving and Dhaka doesn't, so recalculate the overlap after each clock change.