I also wonder about this, also if you imprint jewelry, and you keep aha halo on you, then it will be imprinting new programs on to the jewelry all the time, so it will not be a strong imprint?
I guess you are about to leave the area of well-tested things. As far as I know, there is no instrument that‘s able to detect frequency imprints on a crystal, at least as long as you don’t have an extremely well-shielded room and highly sophisticated lab equipment in your house.
Maybe be one of the first to experiment here?
I could imagine you could measure imprint longevity by doing repeated water freezing experiments. Informed water tends to build much more aesthetic ice forms. Why not imprint a crystal with Water Charger or Solfeggio, put it close to a glass of water and freeze it together with another glass of non-informed water? If effects wear out, both samples should look quite similar.