'Three Days' in the Bible

And the king will say to Amasa, Call together to me the men of Judah in three days, and stand thou here.

And Gad will come to David and announce to him, and say to him, Shall seven years of famine come to thee in thy land? and if three mouths to flee before thine adversaries, they pursuing thee? and if death to be three days in thy land? now know, and see what word I shall turn back to him sending me.