The session lasts for 60 minutes, the chamber will take around 3 minutes to reach the correct pressure. During this time you may feel a bit of discomfort in your ears similar to what you experience when you are going up in an air plane. There will be someone right outside the chamber the whole time the pressure is being increased and decreased at the end of the session. It is completely at your pace so you feel comfortable the whole time. Once the chamber is at pressure, sit back and relax!