I'm not sure of the number of hours. It was a long day in the pool. Dylan's pool instructor had commented on how impressed she got everything the first time and did it in less time than was required. Perhaps there was a time limit for the pool portion, in which skills had to have been mastered... I've never taken the course and don't pretend to be knowledgable in these things. But it made it sound like because Dylan showed mastery of the lessons, she finished early? I'm not entirely sure, but I remember thinking that just because she was able to get it done on the first time surely didn't mean that she wouldn't have to practice the skills over and over again.