seven years
2 Samuel 2:11
And the time that David was king in Hebron over the house of Judah was seven years and six months.
1 Kings 2:11
And the days that David reigned over Israel were forty years: seven years reigned he in Hebron, and thirty and three years reigned he in Jerusalem.
1 Chronicles 3:4
These six were born unto him in Hebron; and there he reigned seven years and six months: and in Jerusalem he reigned thirty and three years.