Answer by taking a quote from the following article:

Elmer Kenneth Strong (April 21, 1906 - October 5, 1979) was an American football halfback and fullback who also played minor league baseball. Considered one of the greatest all-around players in the early decades of the game, he was inducted into the College Football Hall of Fame in 1957 and the Pro Football Hall of Fame in 1967 and was named to the NFL 1930s All-Decade Team. A native of West Haven, Connecticut, Strong played college baseball and football for the NYU Violets. In football, he led the country in scoring with 162 points in 1928, gained over 3,000 yards from scrimmage, and was a consensus first-team selection on the 1928 College Football All-America Team.

In 1933, Strong signed with the New York Giants. The 1932 Giants had compiled a 4-6-2 record, but the 1933 Giants, with Strong at fullback and Harry Newman at quarterback, improved to 11-3 and advanced to the 1933 NFL Championship Game. Strong led the NFL with 64 points in 1933; his points were scored on three rushing touchdowns, two receiving touchdowns, a touchdown on an interception return, five field goals, and 13 extra points. On November 26, 1933, he became the first known player in NFL history to score on a fair catch kick. The 30-yard kick was made at the Polo Grounds in a win against the Green Bay Packers. After the 1933 season, Strong received first-team All-Pro honors from the United Press, Collyer's Eye, and the Green Bay Press-Gazette.  In 1934, Strong again played in every game for the Giants as a fullback. He rushed for 431 yards and scored 56 points (six rushing touchdowns, four field goals, and eight extra points) in the regular season. His greatest fame derives from his role in the Giants' comeback victory over the Chicago Bears in the 1934 NFL Championship Game; Strong scored 17 points for the Giants on a 38-yard field goal, two fourth-quarter touchdowns on runs of 42 and 8 yards, and two extra points. Strong received first-team All-Pro honors in 1934 from the NFL and others.  In 1935, Strong helped lead the Giants to their third consecutive NFL Championship Game. In a 10-7 victory over the Brooklyn Dodgers, he was only able to play a few minutes due to injury, but he still managed to score all of the Giants' points on a 24-yard touchdown run and a 24-yard field goal. Slowed by injury in 1935, he was described as "a celebrated invalid" who "hobbled" from the bench to kick a field goal for the Giants in a 3-0 victory over the Bears on November 17. In the 1935 NFL Championship Game, a 26-7 loss to the Detroit Lions, Strong scored all of the Giants' points on a long touchdown catch and run and the extra point.

How long was he with the Giants?