Hello Christine, thanks for your feedback. I am happy to explain the reason why the dive was shorter than expected.
The dive was shorter than expected because you breathed all your air quickly. As a matter, we always surface with a safety margin. We can assure you that time at the pool is essential to learn the basic skills needed for the ocean part. At the depth of 1.2 meters (our pool depth), you didn't breathe half of your air :) but anyways; thankfully thousands of beginners like you appreciate our program. We wish you a lovely holiday in Madeira.