How many months did Bob Woodward and Carl Bernstein spend on the Watergate story?

Bob Woodward and Carl Bernstein spent approximately two years investigating the Watergate story, from 1972 to 1974. Their reporting began in June 1972, following the break-in at the Democratic National Committee headquarters, and continued until the resignation of President Richard Nixon in August 1974. This extensive investigation involved numerous interviews and extensive research, ultimately leading to significant revelations about the scandal.