Great Question Big Sharky. The length of the experience is very much dependent upon the user who is going through the experience and how comfortable they are with the Virtual Reality system. Having said that, it would take no less than 15-20 minutes and could go up to an hour. However, as per medical advice, we recommend that users do not spend more than 30-45 minutes performing the activity on a single day. We also recommend that this activity would be performed with one day break in between each experience.