Mumbai is 4.5 hours ahead of Berlin (winter) or 3.5 hours ahead (summer). When it's 12:00 PM in Berlin, it's 4:30 PM in Mumbai. India does not observe DST.
Berlin uses CET/CEST while Mumbai uses IST (India Standard Time).
Optimal window: 10:00 AM - 2:00 PM Berlin time (2:30 PM - 6:30 PM Mumbai). Late morning calls from Berlin reach afternoon business hours in Mumbai.
Mumbai is India's financial capital with significant German banking and industrial presence.