I usually see a quick separation of some of the nps, and the rest slowly appears from 15-45 minutes. What method are you using to mix it? You want to make sure the nps "touches" as much of the base soup possible, without emulsifying it. I usually use a 'bicycle pedal' motion to turn the vessel( mason jar) end over end about 40 times, let it separate for a few, then do that again the more times before pulling. The first motion doors separate wicker than the fourth. Sometimes, I'll also lay towels or and roll the jar back and forth on the floor. Careful with that though, I've yet to experience a exploded vessel, but pressure does build. Sure your fine, report your progress and yield per pull if you feel like, sure you'll also get feedback.
Happy extracting.
Sine experientia nihil sufficienter sciri potest -Roger Bacon
*γνῶθι σεαυτόν*