Mumbai is 9.5 hours ahead of Philadelphia

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

Philadelphia and Mumbai have no natural overlap. The 9.5-hour gap is simply too large for regular working hours to meet. Treat the handoff like a relay — Philadelphia wraps up and leaves notes for Mumbai to pick up as their day begins. One seasonal catch: Philadelphia springs forward and falls back, but Mumbai doesn't, so the gap changes by an hour for several months of the year.