Delhi observes numerous national and religious holidays, in such cases the commercial places are closed. Most government and private banks are open weekdays 10:00 AM - 2:00 PM and on Saturdays 10:00 AM - 12:00 Noon, they are closed on government holidays. The international airport and some luxury hotels have 24-hour money-changing facilities. The major offices of American Express that offer check-cashing facilities also have extended hours. Western-style hotels will also change money for their guests. Post offices are open Monday-Friday 10:00 AM - 5:00 PM,Saturdays from 10:00 AM - 2:00 PM and are closed on government holidays and Sundays. Most museums are closed on Mondays and site museums (near archaeological monuments) are normally closed on Fridays. Museums are also closed on government holidays. Business hours of market places, shops, bazaars vary from place to place.