This is the 517th most frequent Finnish word.
kuukautta
"Kuukautta" means "months" (partitive singular form) in English.
In this sentence, 'kuukautta' is in the partitive form to indicate a duration of time, specifically three months.
Olin lomalla kolme kuukautta.
I was on vacation for three months.
Here, 'kuukautta' is used again in the partitive case to describe the amount of time that has passed since a certain event.
On kulunut jo kaksi kuukautta siitä tapahtumasta.
It's been two months since that event.
In this sentence, 'kuukautta' is in the partitive form used with numerals or quantifiers to express an approximate duration, here 'a few months.'