four months
I was a retiree (furloughed from a major) and it took about four months from application to getting the "return to active duty orders"
The long pole will be your physical. You will have to basically accomplish an induction physical all over again (even if your AF physical is still current, which mine was).
As far as flying, it depends on if you are a retiree returning or just returning after seperating. If you are returning after separating, it will be much eaiser.
Send my a private post if you want and I might be able to help you out more.
Hope this helps.