One of them,the Apollo-11, traveled to the moon just seven months after the last X-15 flight.

VOA: special.2010.07.07

Eventually, a moon base could let explorers live on the moon for weeks or months.

NPR: NASA's Future Spacesuits Are Made for Walking

Average stockpiles at these companies can last for nearly three months, says Moon.

CNN: Steeling for a Punt?

That phase will last about three months, as the Moon completes three rotations beneath the orbits of the two satellites.

FORBES: NASA's GRAIL Mission Will Unlock Secrets Of The Moon's Interior