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Assuming that they are consecutive months, this depends on which years are involved. 120 months is 10 years. That period must contain at least two, and possibly three, leap years. If there are two leap years then the answer is 3652, and if there are three then the answer is 3653.
That's called a millenium.
1,440 = 120 x 12
It COULD be called a Gigayear, but in practice it is simply called "a billion years".
10 years.