What makes you feel there needs to be a well-defined demarcation line? So you know you've gone past it? So you know you've achieved something? Why must you precisely know?
When you enter into a state of emptiness (no-thought), you don't experience or can even observe thought or emotion. Those don't exist as part of your true self, and neither does time in the linear-sense. Can you know you're in a state of emptiness? No, of course not. If you think you can, you're not in it. There's a reason it's called emptiness/no-thought!
Any realization you may have entered a state of emptiness is in the after-effects. But as long as you want or need it, it will always elude you.
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