FaceGuard generated passcodes are estimated as unbreakable* in less than a trillion years. Your mileage may vary. Change passcodes frequently to be super safe.
*There is no such thing as ‘unbreakable’ given enough time and money. The goal is to deter 99.9% of all hackers in the world and to make breaking into your FaceGuard too expensive and too time consuming to be worth the effort.