1 Kings 11:42

Overview - 1 Kings 11
Solomon's wives and concubines.
In his old age they draw him to idolatry.
God threatens him.
14 Solomon's adversaries were Hadad, who was entertained in Egypt;
23 Rezon, who reigned in Damascus;
26 and Jeroboam, to whom Ahijah prophesied.
41 Solomon's acts, reign, and death. Rehoboam succeeds him.
Treasury of Scripture Knowledge

1 Kings 11:42  (King James Version)
And the time that Solomon reigned in Jerusalem over all Israel was forty years.

Hebrew days. forty years.
Josephus says fourscore years; which is sufficiently absurd. Calmet supposes him to have been 18 years old when he came to the throne, and 58 when he died.