If you've never worked out before, or if it's been a while since you have, then we recommend starting with once a week. Once your body has acclimated, then you can move to twice a week.
This workout is likely very different than anything you've done before. You will be able to access muscles in a way that is not possible in a traditional gym setting.
Because the workouts are high in effort, they don't need to be long. They are very effective at about 15-20 minutes per session.
If you stay active training for a specific sport or endurance event, you know the value of cross-training to enhance performance.
These sessions are designed to enhance your performance, not interfere with your training. That's why once weekly is the perfect match during your training season.