And the time that David was king in Hebron over the house of Judah was seven years and six months.
2 Samuel 2:11
Surrounding context
2:10 Ishbosheth, Saul's son, was forty years old when he began to reign over Israel, and he reigned two years. Only the house of Judah followed David.
2:11 And the time that David was king in Hebron over the house of Judah was seven years and six months.
2:12 Now Abner the son of Ner, and the servants of Ishbosheth the son of Saul, went out from Mahanaim to Gibeon.