Budget 45 minutes to 1.5 hours. You’ll finish closer to 45 minutes if you move briskly through the monastery-wing galleries and treat the museum as a Belém add-on. You’ll need nearer 90 minutes if you read the navigation displays properly and spend time in the Galliot Pavilion with the royal barges and aircraft.
Start in the historic west-wing galleries and follow the museum’s natural chronology: Prince Henry, ship models, navigational instruments, royal rooms, and Far East collections. After that, keep going until you reach the large vessel hall. Many first-timers stop too early and miss the museum’s most dramatic space.
