Santiago is 11 hours behind Shanghai

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

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