The past bull cycles last 7,5 years.( from top to top, eg 2000 - 2007 ) My guesstimate is that this time it won't be different.
October 2007 plus 7..5 years = early 2015.
Bottom March 2009 plus 7.5 years = autumn 2016 next bear market low
October 2007 plus 7..5 years = early 2015.
Bottom March 2009 plus 7.5 years = autumn 2016 next bear market low