I know that cold plunging for 11 minutes a week is what Andrew Huberman recommends but why specifically 11 minutes? If I called plunge for more than that, do I still get the same benefits? Do I get less benefits? Do I get 50% of the benefits above that tell me how it works.

11 minutes per week is a research-informed target, not a proven cutoff or maximum. Huberman describes it as a useful benchmark—especially for metabolic effects—and says it can be divided into two to four sessions of about 2–3 minutes. He does not establish a formula for how much benefit additional minutes provide, so you can’t infer that longer exposure yields the same benefit, less benefit, or a particular percentage more. 1

• Why 11 minutes: It comes from human studies that point to that weekly total; Huberman presents it as a practical number to help people stay consistent, not a strict threshold. 1
• How to divide it: The suggested weekly total can be split across two to four sessions. Søberg also recommends short sessions and cautions against assuming that one long plunge is equivalent: the initial cold-shock stimulus may matter, and extended exposure can become excessive. 2 3
• What longer exposure means: Huberman says that once 11 minutes per week is easy, a person can safely adjust duration, temperature, or frequency—but that is not evidence that more exposure produces proportionally greater benefits. The transcripts don’t provide a percentage-benefit curve above 11 minutes. 4
• How it may work: Cold exposure activates catecholamines, including norepinephrine, epinephrine, and dopamine, which Huberman connects to alertness, mood, and focus. For metabolism, he describes norepinephrine signaling that can promote changes in fat cells toward more metabolically active beige and brown fat. The cited dopamine study used an hour of immersion, however, and he notes that the effects of shorter, colder exposures on dopamine have not been well established. 5 6 7

Prioritize safe, consistent exposure rather than treating 11 minutes—or longer—as a guaranteed dose-response rule. 8