Chicago is typically 11.5 hours behind Mumbai. When it's 9:30 PM in Mumbai, it's 10:00 AM the same day in Chicago. India uses UTC+5:30, creating the half-hour offset. India does not observe daylight saving time, but Chicago does.
During US daylight saving time (March to November), the difference is 10.5 hours. During US standard time (November to March), the difference increases to 11.5 hours.
Optimal meeting window: 7:00 AM - 9:00 AM Chicago time (6:30 PM - 8:30 PM Mumbai, or 7:30 PM - 9:30 PM in winter). Morning Chicago catches evening Mumbai.
Chicago has a large Indian-American community and is a major hub for IT services companies with operations in Mumbai. O'Hare offers direct flights to India.