How Long Might This Bull Market Last?

The current stock bull market began its 29th month as of 07/09/11, having started when the S&P 500 bottomed at 677 on 03/09/09.

There have been 9 other bull markets since 1950.

The average length of time for these 9 previous bull markets has been 4 ½ years or 54 months.  

Three of the 9 previous bulls lasted less than 3 years.  

Source: BTN Research