Question: The Curse of Rocky Colavito is one of several sports superstitions centered on the failure to win a championship in any major league sport for how many years?

Related documents: [0]  [DOC] The Curse of Rocky Colavito is a sports-related curse that supposedly prevents the Cleveland Indians Major League Baseball (MLB) franchise from winning, be it the World Series, the American League (AL) pennant, reaching postseason play, or even getting into a pennant race. Its origin is traced back to the unpopular trade of right fielder Rocky Colavito to the Detroit Tigers for Harvey Kuenn in 1960. It was not claimed that Colavito placed the curse, and he has denied doing so. It is one of several curses believed to have stricken the city of Cleveland's major sports franchises for decades. [END] 
[1]  [DOC] The Cleveland sports curse was a sports superstition involving the city of Cleveland, Ohio, and its major league professional sports teams, centered on the failure to win a championship in any major league sport for a period of 52 years, from 1964 to 2016. Three major league teams based in Cleveland contributed to belief in the curse: the Browns of the National Football League (NFL); the Cavaliers of the National Basketball Association (NBA); and the Indians of Major League Baseball (MLB). Combined with the short-lived Barons franchise of the National Hockey League (NHL), Cleveland teams endured an unprecedented 147-season championship drought, having not won a title since the Browns defeated the Baltimore Colts in the 1964 NFL Championship Game two seasons prior to the first Super Bowl. [END]  
Answer: 52
52