Does neurofeedback create lasting change?

Yes, with practice. Neurofeedback and Calm Heart (HRV biofeedback) reshape brain function when you engage them repeatedly over time, and lasting change accumulates rather than arriving all at once.

The honest answer on permanency is the same as for physical exercise or meditation: maintaining the change and continuing to progress means continuing the practice. Some days go better than others, depending on things like sleep, and that is normal. The effort compounds. Consistent training reinforces what the brain has learned and makes it more durable over the long term.