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.
