78 days is about 2.56 average months of 30.4 days (about 2 months and 17 days)
A month is not very precisely defined (some months are longer than others), but if you divide the number of days by 30, you get a good approximation.
A better (average) length of a month would be 365.2422 / 12 = about 30.4 days.
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