Bulls tend to lead far shorter lives, on average, than cats and dogs, your 30-year mortgage, the neighbor next door, Boeing's 747 and the clothes dryer that always seems to go cold when you can least afford it. The average lifespan of a bull market is 56 months, as in four years and eight months.he 2002-2007 bull lasted five years. The decade-long bull that ended in March 2000, the longest bull in history, lasted 113 months, or more than nine years. It was also the biggest-gainer of all-time, posting a return of 417%, more than double the 162% average gain since 1932.