Forty years — In all, it was forty years and six months (see 2 Samuel 5:5 and 1 Chronicles 3:4). The Jewish writers …

And the days that David reigned over Israel [were] forty
years
So says Eupolemus ^…

These dying counsels concerning Joab and Shimei did not stem from personal anger, but were for the security of Solomon's throne. Joab had committed…