About 60-ish years now since it formally ended, though as with many things in history there isn't quite that clear a cut-off as historians would like there to be (the lest 40 years of the age of conquest where mostly crushing the last few well-entrenched hold-outs, and dealing with a couple of smallish rebellions).
Oh right, if your character is planning on going to the morgue next I'll quickly set the scene for that.