There are slight variations through a year. The average is 29.531 days.
Any specific lunar phase can be observed only at the time when that lunar phase occurs, and not again for 29.53 days thereafter.
One lunar cycle is when the moon goes from one phase through every other phase until it returns to the starting point. This takes 29.53 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.
The lunar phase located 14 days past new moon is a full moon. The full moon occurs when the Earth is roughly between the sun and the moon, causing the entire illuminated side of the moon to be visible from Earth. This phase is characterized by a complete circle of light on the moon's surface.
29 1/2 days, or a month.
It takes about 29.5 days for the moon to go through all its phases and return to the same phase again, known as a lunar cycle or lunar month.
The moon displays a complete cycle of all its phases every 29.53 days.
A lunar month is about 29.5 days long. Each moon phase, such as the new moon, first quarter, full moon, and last quarter, lasts for about 7-8 days.
The length of each moon phase varies, but on average, each phase lasts about 3.5 days. The complete lunar cycle, from one new moon to the next, is about 29.5 days.
The last three days of a lunar cycle are often referred to as the waning crescent phase. During this phase, the illuminated portion of the Moon visible from Earth decreases each day until it is no longer visible, marking the end of the lunar cycle.
29.5 days
Moon's phase cycle from New Moon through to Full Moon takes 29.53 days. More details are on the related link (Click 'Lunar phase' below)