Roughly approximately about 29.531 days, which is 4.2187 weeks.
Two weeks after the waning gibbous phase of the moon you will see a new moon.
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.
A solar eclipse can only occur at the moment of New Moon. Two weeks after that moment is about 18 hours before Full Moon.
The phase of the Moon that comes immediately before the new Moon phase is the waning crescent phase.
Waning Gibbous is the moon phase that comes after the Full Moon.
Two weeks after the waning gibbous phase of the moon you will see a new moon.
Approximately two weeks after the new moon, the phase of the moon is the full moon. This is because it takes about 29.5 days for the moon to complete its cycle from new moon to new moon, with the full moon occurring halfway through.
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 cycles through 4 phases every month. There are about 3 weeks between the first and last quarter phases of the moon.
A solar eclipse can only occur at the moment of New Moon. Two weeks after that moment is about 18 hours before Full Moon.
Two weeks or, more precisely, about one half of the synodic period of 29.53 days.
New Moon.
A waxing Moon can be seen when the Moon is larger in the sky, and is moving from the new Moon phase, and into the full Moon phase. A waning Moon is seen when the Moon is visibly smaller in the sky, and is moving from the full Moon phase, and into the new Moon phase.
The complete cycle of all moon phases runs 29.53 days. (rounded)From New Moon to Full Moon is 1/2 of the cycle, so you're looking at 14.77 days. (rounded)
The phase of the Moon that comes immediately before the new Moon phase is the waning crescent phase.
The New Moon always occurs very close to the moon's "new moon" phase.
Almost 4 weeks.