[@Chasebloodcrest] It may not necessarily have continued to last for all his fantasies, though deep trance hypnosis can last for many hours. I know a practitioner who had someone under for over twelve hours once. That being said, if his imagination was active he was likely in deep sonambulism rather then full on coma state/deep trance. 

It's important to note that the hypnotic "coma" state and medical coma are also two very different things ^^

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I'm a qualified hypnotherapist. I studied Clinical Hypnotherapy, NLP and CBT techniques at a well known college in London. My case studies included things like curing phobias, addictions like alchoholism and cigarettes, MPD, trauma and memory issues. I have a preference for relaxation induction over authoritarian, though I'm happy using either. 

I decided not to go into practice due to some... interesting... experiences as well as being the youngest to qualify at the time. While I can't go into detail, out of all the cases I did do, the one that stuck with me most was one of the simplest cases. Helping a lifelong dancer who was unable to smile during her performances.