The exact number varies, but roughly 29.5 days. The link will explain why.
It takes the moon 29 days or about 1 month to orbit the earth.
About 1 month
27.3 days (a sidereal month)
The moon revolves around earth once in 27.32 days. It displays a full cycle of phases in 29.53 days.
The moon orbits around the Earth approximately once every 27.3 days. This period is known as a synodic month or lunar month.
It takes precisely 27.3 Days for the moon to orbit the earth.
A month (27 days 8 hours).
27
The Moon completes its orbit around the Earth in approximately 27.3 days (which is also called a sidereal month).
30 days are in the month of September
There are thirty days in the month of June.
There are 31 days in the month of October.