Not much because the moon is always a full moon and we dont have another moon but what i think your talking about is 29.5 days.
It takes approximately 29.5 days for the moon to go through all its phases and become a full moon.
It takes about 14 days for a new Moon to turn in to a full Moon, and vice versa.
It takes approximately 7.4 days from a full moon to reach the third quarter phase.
A full revolution around Earth takes about 27 1/2 days. A full cycle (from full moon to full moon for example) takes a bit longer: 29 1/2 days.
it takes 27 days and almost 17 hours is an average per 12 months
28 1/2 days
The moon takes about 7 days to transition from a Full Moon to a Waning Gibbous phase.
It takes a full month to see all phases of the moon, then it begins again.
The moon is always half lit as it revolves around the earth. When the moon is directly between the earth and the sun we can not see the side that is in sunlight because it faces away from us. As it continues to rotate around the earth we see more and more of the lighted side of the moon. When it finally gets to the point directly opposite the sun, we see the whole lighted moon, or the full moon. As it continues to rotate we see less and less of the lighted side until it is again directly between earth and the sun, and we see no moon at all: the new moon, or dark of the moon. It takes 14 days for the new moon to become a full moon, so it would take about 12 days for a crescent moon to become full.
The Lunar cycle takes 28 days. That's how long it takes to go from one full moon round to the next.
It takes 27.3 days. So you could just say around 27 days.
It takes about 29.5 days for the moon to complete one full phase cycle, from new moon to full moon and back to new moon again.