Session I: 6:30 AM - 3:40 PM IST
Break: 3:40 - 4:35 PM
Session II: 4:35 PM - 2:45 AM IST (next day)
Monday to Friday, except NSE IX holidays.

The evening session overlaps US market hours, and NSE IX runs its own holiday calendar, so GIFT Nifty can trade on Indian holidays. Timings can change by circular: NSE IX has the current notice. World hours: global indices.