Within two full years will I bring again into this place all the vessels of the LORD's house, that Nebuchadnezzar king of Babylon took away from this place, and carried them to Babylon:
Within two full years - literally, years of days. So "a month of days" - i:e., all its days complete (Genesis 29:14, margin; 41:1). It was marvelous presumption to speak so definitely without having any divine revelation.