Check out the forums over at Baseops.net. Within 1 yr seems to be the norm although I have personally seen guys with about 3 yrs left get approved recently. You never know untill you apply, but be warned; you'd better have an understanding Sq/CC AND an understanding Gp/CC AND an understanding Wg/CC. Get the picture? Sure, only the SECAF's office can
approve/dissaprove, but the next 6 yrs of your life could become difficult if you aren't careful. Good luck with whatever decision you make.