There is no objective answer to this question.
It all depends on your initial level, your objective (understand films in their original language, communicate when travelling, have fluent conversation when travelling, become bilingual, etc.), how much time you will spend learning with the method each week, and your timeline for reaching your objective.
For example, if you get into the habit of doing five lessons under hypnosis each week for three months, that’s about 30 hours under hypnosis. That’s enough to acquire a very good basis and have more natural reflexes in the language.