That's 1/4 of the complete cycle of phases. 29.531/4 = 7.38 days .
The time from New Moon to Last Quarter is 22.15 days.
seven
From Last Quarter , through NEW Moon, to First Quarter is approximately 14 or 15 days.
about 3 or 4 days
The time period between Full Moon and Third Quarter is usually 7 or 8 days, depending on the actual Full Moon and Third Quarter times.
The first quarter and last quarter of the moon are each approximately 7 days apart from the new moon and full moon, respectively. Since the full moon occurs about 14 days after the new moon, the first quarter and last quarter phases are roughly 7 days apart from each other. Therefore, the first quarter and last quarter of the moon are about 14 days apart.
The four main phases of the moon—new moon, first quarter, full moon, and last quarter—each occur approximately 7.4 days apart. The entire lunar cycle, lasting about 29.5 days, is divided into these phases: the new moon to the first quarter takes about 7.4 days, the first quarter to the full moon another 7.4 days, the full moon to the last quarter approximately 7.4 days, and the last quarter back to the new moon also about 7.4 days.
About 22; slightly under that, by a few hours.
I would expect that period of time to comprise 3/4 of a full cycleof phases, or about 22.15 days.
About 22 days
From NEW Moon to FIRST QUARTER is approximately 7 days. However, it is only visible as a crescent for about 3 to 4 days, when closer to the First Quarter.
Seven days. The Moon takes approximately 28 or 29 days to make one orbit/revolution of the Earth. From NEW Moon to first Quarter ; 7 days First Quarter to FULL Moon ; 7 days FULL Moon to Last Quarter ; 7 days Last Quarter to next NEW Moon ; 7 days. NB The number of days is NOT exact , because the Moon's orbit about the Earth varies on both speed and distance. This is normal Newtonian Mechanics(Gravity) in action in Space.