1.75 years
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12 months = 1 year 21 months = 21/12 years = 1.75 years = 1year 9months
There are 12 months in one year. Therefore, 252 months is equal to 252/12 = 21 years.
12 months/year x 21 years = 252 months
1 year = 12 months 2 years = 24 months 3 years = 36 months . . 10 years = 120 months . . 20 years = 240 months 21 years = 252 months
21 days and no hours