'Months' in the Bible

At this time Moses was born, and he was beautiful to God. {He} was brought up [for] three months in [his] father's house,

So he stayed a year and six months, teaching the word of God among them.

So he entered into the synagogue [and] was speaking boldly for three months, discussing and attempting to convince [them] concerning the kingdom of God.

and stayed three months. [Because] a plot was made against him by the Jews [as he] was about to set sail for Syria, he came to a decision to return through Macedonia.

Now after three months we put out to sea in a ship that had wintered at the island, an Alexandrian [one] {with the twin gods Castor and Pollux as its insignia}.