Government Offices/Shops: Monday - Friday, 10:00 - 17:00 hrs.
Banks: Monday - Friday, 10:00 - 14:00 hrs, Saturdays, 10:00 - 12:00 hrs.
Some commercial offices operate on a five-day week, with Saturdays and Sundays off. Others work a half-day on Saturdays. Office hours tend to be 09:30 - 18:00 hrs.
Shops do not have any standard timings. In major metros, you may find malls and department stores open until 20:00 hrs, seven days a week. Shops in business areas tend to close a little after office closing time. In tourist areas, you will probably find small stores open late into the evening. In many small towns, shops would tend to close around 20:00 hrs.
Restaurants and bars have different legally-enforced closing hours in different states. In most parts of the country, this would be around midnight or even earlier. The only food establishments legally open 24 hours a day are coffee shops in five-star hotels.
Note: Some government and commercial offices are open on alternate Saturdays.