The Egyptian weekend starts Friday. For some people it includes Saturday, and for others, such as craftsmen and laborers, Sunday is the traditional day off. To make things even more complicated, the government recently instituted Thursday as a holiday for some government workers in an attempt to ease crowding and traffic in city centers. Just know that you won't be able to conduct any official business on Friday and usually Saturday as well.
Banks are open for business 9 AM to 2 PM Sunday through Thursday. In addition, you can withdraw money from your home bank using the ATM machines found outside major banks and inside hotels.
Businesses usually open by 8 AM and close by 4 or 5 PM Sunday through Thursday.
Gas stations in cities and along main highways are open around the clock, seven days a week. Most accept credit cards.
Most museums are open daily 9 AM-4:30 PM, except for holidays.
Most shops are open by 9 AM in summer and 10 AM in winter; they stay open until about 10 PM. Many stores close during Friday prayers, which begin at noon (1 PM in summer) and last for 15 minutes, open for the latter half of Saturday, and are closed Sunday. Cairo's celebrated Khan al-Khalili bazaar is open Monday through Saturday 10-9.