how long do new moons last
Best Answer: Technically each cardinal phase (First Quarter, Full, Last Quarter and New) are all momentary events. They occur at specific times and then pass immediately. A better way to ask the question is to ask how much time passes BETWEEN each phase. The answer to that question is 29.5 / 4 days. 29.5 days is the number of days that it takes for the moon to cycle through it's phases (called the synodic month)... The interstitial phases (Waxing Cresent, Waxing Gibbous, Waning Gibbous, and Waning Cresent) also last 29.5 / 4 days each...