Throughout the year, apart from Festivals, businesses in India are open at the following hours:

Government Offices: Mondays to Fridays: 09.30 - 17:30.
Offices: Mondays to Fridays: 09.30 - 17:30 (on Saturdays until 14:00).
Banks: Mondays to Fridays 10:00 - 15:00 (on Saturdays until 13:00).
Stores: Mondays to Saturdays 09:00 - 19:00.
Comment:
Some stores in India are also open on Sundays.