How many hours of HBOT a person needs depends on the severity of the health issue(s). 1 – 5 (60 min) sessions improve cellular energy, decrease inflammation, and initiate tissues repair and regeneration. 5 – 10 sessions are typically used for acute injuries with soft tissue damage and pain. 10 – 20 sessions are for more serious acute injuries or chronic injuries. 20 – 40 sessions are commonly used for major tissue damage when new tissue is required and for various chronic illnesses and brain conditions.