'Months' in the Bible

The length of time that David was king in Hebron over the house of Judah was seven years and six months.

In Hebron he reigned over Judah seven years and six months, and in Jerusalem he reigned 33 years over all Israel and Judah.

The ark of the Lord remained in his house three months, and the Lord blessed Obed-edom and his whole family.

When they had gone through the whole land, they returned to Jerusalem at the end of nine months and 20 days.

So Gad went to David, told him the choices, and asked him, “Do you want three years of famine to come on your land, to flee from your foes three months while they pursue you, or to have a plague in your land three days? Now, think it over and decide what answer I should take back to the One who sent me.”