Personnal Experience:
Speak to Boss, get him/her on side regarding replacement of you in your post. Chat to Desk officer who will advise you on whether your rank/branch/specialisation is able to release you.
In 2007, the norm for S/L Pilots was 12 mths from date of application to last paid day of service. The decision rests with PMA. I was offered some tasty little OOA jobs at my 'career' interview which I politely declined.
Regards