about 571 days
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Days on the moon are 29.531 earth days long.
1 year = 365.242199 days
eclipses can be about 2 days long.
There are 2.54 centimeters in an inch. Given that 1 centimeter equals 571 kilometers, you can convert this to miles by first converting kilometers to miles (1 km = 0.621371 miles). Therefore, 1 inch is equal to (2.54 * 571 * 0.621371) miles.
Mercury has a year that is only 88 days long.