Hi there,
I wonder if you are getting confused with the one day Mindful Mamma course, which is 6 hours, not 9 hours? Or you could be thinking of any other hypnosis for birth course, of which there are a few, and it can get confusing. Basically, HypnoBirthing - the Mongan method is what we these replies are referring to, and what this website is about - and it is always at least 12 hours over at least four sessions. That's how you know you're getting the real deal. If you are being offered Mongan's HypnoBirthing course for any fewer hours than that, something is wrong with the way the practitioner is going about it - don't go there!
The one day Mindful Mamma course is not the same. It is shorter, and it covers different things. I happen to teach both, so I know the difference, and I would just say that as a golden rule: the more time you put into your birth preparation the better, and a four week course will give you more - by definition - that a one day course.
I hope that helps!
Mia