How long after landing did the Apollo 11 moonwalk begin?
Answer
6 hours, 39 minutes
The Apollo 11 moonwalk began about 6 hours and 39 minutes after the lunar landing.
The lunar module Eagle landed in the Sea of Tranquility at 20:17 UTC on July 20, 1969. Neil Armstrong opened the hatch and stepped onto the surface at approximately 02:56 UTC on July 21. The interval was about six hours and 38 minutes when measured from the recorded times, commonly rounded to 6 hours, 39 minutes.
The delay was deliberate. Armstrong and Aldrin needed time to complete post-landing checks, configure the cabin, prepare their suits and portable life-support systems, and depressurize the lunar module. Armstrong went outside first; Aldrin followed about 19 minutes later. The pair then spent roughly two and a half hours exploring and collecting samples.