It takes …Twenty-nine days, 12 hours, 44 minutes and three seconds from a new moon to a new moon.Thirty-five days for a mouse to reach sexual maturity.Twelve weeks for a U.S. Marine to go through boot camp.Eighty-nine days and one hour for winter to come and go.
Two hundred fifty-eight days for the gestation period of a yak.Two years for cheddar cheese to reach its peak flavor.Six years for a snail to live its full life span.Eighteen hundred years to complete the Great Wall of China.Five hundred thousand years for plutonium-239 to become harmless.