Calgary is 11.5 hours behind Mumbai

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

With 11.5 hours between them, Mumbai and Calgary 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 Calgary or a late finish for Mumbai — pick whichever team has more flexibility. Note the seasonal wrinkle: when Calgary is on daylight saving and Mumbai isn't, the gap between them grows or shrinks by an hour.