The chart above from www.chartoftheday.com shows all the post-massive bear market rallies .   A “massive” bear market is defined as a decline of 50+%.   There have been only three bear markets where the  Dow declined more than 50% (in the 1930’s and one in the 1940’s) and the most recent financial crisis 2007-2009).

The initial rally lasted roughly 300 trading days and and then becomes range bound.    Based on this post-massive bear market rally pattern, the current range bound could continue until early 2011 ( 200+ more days)