As noted here with emphasis after the Dem debate when we got the first 'unclassified' hints at what re-deployment will look like (and how much it will cost), finally more details:
Watching them drive by at 30 miles per hour, would take 75 days. Bumper-to-bumper, they would stretch from New York City to Denver. That's how U.S. Air Force logistical expert Lenny Richoux described the number of vehicles that would have to be shipped back from Iraq when the current deployment is over. These include, among others, 10,000 flatbed trucks, 1,000 tanks and 20,000 Humvees.
Even in an emergency, said Col. Richoux in DefenseNews, the evacuation of 162,000 troops in 23 ground combat brigades and millions of tons of equipment would take some 20 months. Military shipping containers, end to end, would stretch from New York City to the gates of the U.S. Military Academy at West Point.
-Wash Times
Therefore, the whole idea of a 'six month' timetable has been a non-starter (and a 'lie'?).
I swear, when the history of this Iraqi debacle is finally all compiled - if it ever can be, given how fast some must be covering their tracks - it will be nothing but one jaw-dropping page after another of, "I cannot believe such a conspiracy against the public could exist for so long and with so many complicit", or something like that.