The average time for one lunar phase cycle (otherwise known as the synodic period of the moon; lunation) is 29.530589 days, or 29 days, 12 hours, 44 minutes, and three seconds. Alternately, a lunation is commonly defined as the mean time between successive new moons.
(For the time being, this will be my place for storing my perpetual roleplay boards, unfinished fanfics, and drabbles, etc. Entries with possible spoilers will be cut so as not to step on any paws, and consider yourself forewarned for the occasional bit of adult content and/or profanity. That's.. it, really.)