A full Moon cycle - for example, from one new moon to the next - is about 29 1/2 days.
28 days.
29.53 days
29.53 days
29.53 days
29.53 days
It takes the moon 29 and a half days to go through each cycle.
29.53 days
29.5 days
29.5 days
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.
The moon completes one full cycle, from new moon to new moon, in about 29.5 days. This is known as a synodic month.
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.