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Subways and buses run around the clock, as do plenty of restaurants. Some shops and services have longer hours than you'll find elsewhere in the United States, so you can get groceries, or get your nails done, at 11 pm. In general, though, you can safely assume that most shops are open seven days a week, from about 10 to 7 Monday through Saturday, and from noon to 6 on Sunday. Bars generally close at 4 am, though some after-hours clubs are open later.