Why 15 Minutes? The Science Behind the Session Length

One of the most common questions we receive is: why exactly 15 minutes? The answer lies in the neuroscience of autonomic state transitions and the pharmacokinetics of the body’s own neurochemistry.

Research on parasympathetic activation shows that the nervous system requires approximately 4-6 minutes of sustained, coherent stimulation to begin the shift from sympathetic to parasympathetic dominance. By minute 8-10, most individuals reach peak parasympathetic activation, with measurable drops in cortisol and increases in vagal tone.

The final 5 minutes of a TUNE session are designed to stabilize this new state — allowing the nervous system to ‘set’ in the parasympathetic mode so the benefits persist after the session ends. Ending too early risks an incomplete transition; going significantly longer offers diminishing returns and can actually trigger a rebound sympathetic response.

We arrived at the 15-minute protocol through extensive dose-response testing across hundreds of participants. It represents the optimal balance of efficacy, practicality, and sustained benefit — long enough to produce meaningful change, short enough to fit into any schedule.