how long does a waxing crescent last
Best Answer: If New Moon is day 0, the waxing crescent usually becomes visible about a day later, and remains a progressively fatter crescent until First Quarter, which is about 7.7 days after New.Full Moon is 14.75 days after New. Third Quarter comes 7.7 days after Full.Source(s):ating Newest Oldest. Best Answer: If New Moon is day 0, the waxing crescent usually becomes visible about a day later, and remains a progressively fatter crescent until First Quarter, which is about 7.7 days after New. Full Moon is 14.75 days after New.