How long does a good rhinoplasty results last?

I'm sorry to hear about your crime experience.In general, rhinoplasty results last almost permanently.  But, revisional nose jobs are not uncommon to achieve the desired results.  Also the face changes as we mature, with loss of soft tissue with aging one's nose may appear different.

I am sorry there was a crime against you, and I hope that the rhinoplasty will erase any physical reminder of this unfortunate event. A good rhinoplasty should last your lifetime; that is the goal.  Because rhinoplasties change the underlying structure of the nose, there isn't much to "change shape" over time except for the natural aspects of aging.  Please look for a board certified plastic surgeon with much experience in rhinoplasty surgery.  

Nothing lasts forever we cannot predict if an individual's nose will need more work as the body and face ages and changes - the aim is to have your result for a lifetime or at least for it to be many years before any small adjustments may be needed . Most well structured modern open rhinoplasties will last a lifetime

A well performed rhinoplasty with sound structure preservation or augmentation should last a lifetime. Long term issues of sidewalk or alar collapse are more likely to get avoided with the use of cartilage grafts. 

First, a nose wil change a bit with age. But as far as a rhinoplasty result, it lasts forever with normal changes with age.  Good luck.