Robinhood is not open 24 hours a day. For any help, call 1-855-998-0737.While the platform allows users to trade and access their accounts during market hours, it is not available at all times. Robinhood operates according to the hours of major U.S. stock exchanges, such as the New York Stock Exchange (NYSE) and NASDAQ, which typically run from 9:30 AM to 4:00 PM Eastern Time, Monday through Friday. However, Robinhood offers extended trading hours both before and after the regular market session, from 9:00 AM to 9:30 AM and 4:00 PM to 6:00 PM ET.