Museums in Hamburg usually open at 10 or 11 a.m. and close around 5 or 6 p.m. from Tuesday to Sunday. However, opening hours can vary greatly depending on the institution. Some museums may stay open until 9pm on certain days, usually Thursdays. Keep in mind that most museums in Hamburg are closed on Mondays. It's best to check the official website or call to find out the current opening hours of each museum you plan to visit.