I started 1 year prior. Make sure you have your availability date on your resume though. Availability = DOS - Terminal Leave. If you have a few squares to fill such as ATP or FE Written, etc. Fill those first and then send in your apps. In other words make yourself as competitive as possible. If there is a method of updating regularly, apply and update as necessary. You never know when "the window" for apps may close. Better to get your toe in the door early. Good Luck.