Aaron:
Milo:
Keep in mind this answer is given purely in terms of the MCTB framework:
There is a defined endpoint only to the 'breadth' dimension of vipassana. It's the completion of 4th path, with a fundamental and stable transformation of your baseline reference frame of experience and all the benefits that come from it. You should be able to identify relief from that particular existential dissatisfaction (dukkha) that comes from identifying around your previous frame of reference. If you're still regularly experiencing that particular existential dissatisfaction in your base frame of reference, you can safely assume there's still fuel to be burned in vipassana practice and you are not done, even if you can't yet identify what the form of that fuel is.
Also it's important to note that under the MCTB framework, even after 4th path, development can continue along the axes of depth of vipassana, morality, concentration, teaching ability, etc.
Could I inquiry into what you mean here by existential dissatisfaction? You seem to make a distinction of the types before and after this frame of reference is broken. How would one know the difference?
If you like canon references, you'll want to see the
Sallatha Sutta (The Arrow).
But here's a quick and dirty summary:
Before that frame of reference is broken, when something unpleasant happens to you, there's the intial pain of the experience (The first arrow), and then there's a whole feedback loop in your mind about all the circumstances around it, what it means for who you think you are, why it had to happen to you, and on and on. That second part (The second arrow) is the existential part because it comes from how you are subtly conditioned to seeing yourself in relation to the 'stuff' that's going on, i.e. your frame of reference.
After that frame of reference is broken, when something unpleasant happens to you, there's the initial pain, but the whole downward mental spiral gets cut from there. You have a fundamentally different relationship with the 'stuff' and don't get hit by the second arrow.
Make sense?