I think people should be aware that there are probably a lot of alkaloids being wasted with this method, even with extended soaking. I suggest NOT discarding the material after the soak, and doing an A/B extraction on it to retrieve alkaloids.
In freebase form, harmalas are already not very soluble in IPA/Acetone (significantly more-so in methanol but methanol is poisonous, so if anybody uses methanol instead, after its all evaporated add ethanol/acetone/IPA and evap again to get rid of methanol traces).
But in caapi the harmalas are naturally in salt form, so they will very likely be very very poorly soluble in ipa/acetone. Either freebase the material before the soak, and/or be sure to not throw it away and a/b extract afterwards