It takes the Moon approximately 27.3 days to revolve around Earth and rotate once on its axis. This is known as the sidereal month.

Here's the breakdown:

* Revolution: The time it takes the Moon to complete one orbit around Earth.

* Rotation: The time it takes the Moon to spin once on its axis.

Interestingly, the Moon's rotation period and its revolution period are the same, which is why we always see the same side of the Moon.