Detailed Instructions: In this task, you're given a passage, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both passage and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the passage or linked information.
Problem:Passage: The 1924 World Series was the championship series of the 1924 Major League Baseball season. A best-of-seven playoff, the series was played between the American League (AL) pennant winner Washington Senators and the National League (NL) pennant winner New York Giants. The Senators defeated the Giants in seven games to win their first championship in club history. The Giants became the first team to play in four consecutive World Series, winning in 1921–1922 and losing in 1923–1924. Their long-time manager, John McGraw, made his ninth and final World Series appearance in 1924. The contest concluded with the second World Series-deciding game which ran to extra innings (the first had occurred in 1912). Later, the Senators would reorganize as the Minnesota Twins, again winning the World Series in 1987 and in 1991.
 Link Information: McGraw became the third of three managers for the New York Giants in 1902, and held the position until 1932 Answer: 30
Solution:
For how many years did the Giants' manager serve in this role for the team?