Dream somnambulism and hypnotic somnambulism are two different phenomena with distinct characteristics and durations:
Dream Somnambulism (Sleepwalking): Dream somnambulism, commonly known as sleepwalking, occurs during non-REM (rapid eye movement) sleep and is not associated with hypnosis. It typically happens in the earlier part of the night during deeper stages of sleep. Sleepwalkers may perform various activities while asleep, such as walking, talking, or even more complex behaviors. The duration of sleepwalking episodes can vary widely, but they usually last a few minutes to half an hour.
Hypnotic Somnambulism: Hypnotic somnambulism refers to a trance-like state induced by hypnosis. It is a condition in which a person is deeply hypnotized and may exhibit heightened suggestibility and responsiveness to the hypnotist's suggestions. The individual appears to be in a sleepwalking state while being responsive to the hypnotic commands or suggestions. The duration of hypnotic somnambulism can vary depending on the hypnotic techniques used and the individual's responsiveness to hypnosis. It may last for several minutes to an hour or more during a hypnotic session.
In summary, dream somnambulism (sleepwalking) occurs during sleep, usually during non-REM stages, and its duration is typically a few minutes to half an hour. On the other hand, hypnotic somnambulism is a trance-like state induced by hypnosis and may last for several minutes to an hour or more, depending on the hypnotic process and the individual's responsiveness to suggestion.