Mumbai and Chennai are on the same time. Both cities use Indian Standard Time (IST, UTC+5:30). When it's 12:00 PM in Mumbai, it's also 12:00 PM in Chennai.
India uses a single time zone across the entire country, so all major cities share the same time.
Any time works! Since both cities share the same time zone, you can call during normal business hours (9:00 AM - 6:00 PM) without any conversion needed.
Mumbai and Chennai are India's financial capital and fourth-largest city respectively. Mumbai is the entertainment and business hub, while Chennai is known for automobiles, IT, and healthcare. Flights between cities take about 2 hours.