The cycle of the moon's phases runs 29.53 days.
7 days
It takes about 29.5 days for the moon to complete a full lunar cycle and reappear in the same phase. This cycle includes all the phases of the moon, from new moon to full moon and back to new moon again.
The full lunar cycle is roughly 4 weeks, and from full-moon to new-moon is half the cycle, so it would take (roughly) 2 weeks to go from full to new moon.
29.53 days is a synodic period. One Full Moon to the next.
A full cycle is about 29.5 days, so a quarter cycle will be 1/4 of this, on average (divide 29.5 by 4). This is just an average; since the Moon's orbit is not a perfect circle, it may vary a bit.
1 month.
29.53 days
29.5 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.
29 and 1/2 days.
It takes about 29.5 days for the moon to complete an entire phase change cycle, which includes all the phases from new moon to full moon and back to new moon. This period is known as a lunar month or synodic month.
7 days
7 days
It takes about 29.5 days for the moon to complete a full lunar cycle and reappear in the same phase. This cycle includes all the phases of the moon, from new moon to full moon and back to new moon again.
29.5 days
29.5 days
28 days