2 Samuel 2:1, 3, 11

Then it came about afterwards that David inquired of the LORD, saying, “Shall I go up to one of the cities of Judah?” And the LORD said to him, “Go up.” So David said, “Where shall I go up?” And He said, “To Hebron.”

And David brought up his men who were with him, each with his household; and they lived in the cities of Hebron.

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