I could have got mine done before May of 2012. No one was screaming to get it, hence no one was really trying to get one, we all knew we had to have it to get promoted to Lt Col, we figured we had time and just maybe we would get the opportunity to get a real degree. Getting a Master's Degree early out of the gate has created a very easy discriminator for the PRF process.
Message for the guys out there who are in the 2005 year group or later, 2004 its too late: if you think getting it done before your board is your goal you should really reevaluate that stance. Maybe we can get some Group/Wing Execs in here to confirm but the actual racking and stacking of everyone will occur much earlier. I will end up being done about 6 months before the board but I would really rec you being done 9 months before the board, just in case your paperwork or AFIT screws up your degree status you don't look like a POS without a Master's Degree to your Senior Rater.
Call me careerist but I believe we have a duty to not only say a Masters is important to the Air Force but it is also important to your Senior Rater well in advance of the magical board date.
Who knows what the next discriminator will be, PHD's? A second MA, maybe some sort of professional certfication, God forbid it actually boils down to being good at your job.