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period of revolution in Earth years for Mercury is 0.241 and Earth is 1.00. So 2.41 years in Mercury equalls 10 years in Earth. Correction : Using the above figures (which seem about right) : 10 years on Earth equals 10/0.241 years for Mercury. That's about 41.49 Mercury years.
10 hours
20 years is equal to 7300 days. This is calculated by multiplying 20 years by the number of days in a year (365 days).
A year has about 365.25 days, so you can divide by that number.
A year is about 365.2422 days; you can multiply the number of years by this number.