How many days does it take to go from full moon to waning gibbous?

Waning gibbous" is the descriptive term for roughly one fourth of the moon's entire cycle of phases ... the period of time during which the visible portion of the moon is less than a full disk but more than half a disk, and shrinking as time goes on. This portion of the cycle begins immediately after Full Moon, and lasts roughly 7.4 days.

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