Iraq Timeline: How do you define "six months"

Since the war started in 2003, it's been predicted to be decided in "about six months" just about every six months - for four years. The Center for American Progress has a timeline of the major repeat offenders in the "six months club," including columnist Thomas Friedman. In fact, Friedman has used the phrase so often (14 times since the war began) that a popular blogger coined the term "Friedman unit" to describe a period of about six months.