Neil Armstrong and Buzz Aldrin spent about 21 hours and 36 minutes on the Moon during Apollo 11. They landed on July 20, 1969, and conducted two moonwalks totaling roughly 2.5 hours outside the Lunar Module, with the full surface activity (including time inside the LM on the surface and sample collection) contributing to about 21.5 hours on the lunar surface. Armstrong’s first steps occurred about six hours after landing, followed by subsequent activities before they rejoined the orbiting Command Module and returned to Earth. For context, Apollo 11’s surface operations were carefully timed to ensure crew safety, with NASA documenting the mission timeline and surface duration.[2][5][8]