There have been 11 different teams to win the Super Bowl since the 2001 Superbowl. This table shows the tenure of the head coach, the GM and the QB before winning their first championship. There are two outliers, Bill Cowher getting 14 years before winning a championship, and Peyton Manning taking 9 years as QB for the colts. If those two are removed, the average HC tenure and QB tenure before winning is almost exactly three seasons. Important note, this is to win the super bowl, not to become "competitive" . The facts strongly suggest that if a team is not even competetive after three years of a head coach/ QB combo, it is not likely that combo is going to ever win a championship.