That's a completely fair question, and I hate having to answer this way; "It depends."
Okay, now we have that out of the way, let's explore what that means. First, let's acknowledge that there are no "hypno-miracles."" With some issues, with some people, there is dramatic reduction and even elimination of the complaint during the first session. But I ALWAYS recommend at least one follow-up session, even in those cases. Some issues, like phobias, tend to see results in fewer sessions than others. From there, "it depends."
I would love to be able to say with precision; "this will be resolved in x sessions," but in most cases that is not practical. You need to know how long/how much and I don't have enough information to get there.
So, in an attempt to resolve this dilemma, here's our best bet:
Let's discuss the details around what you are facing and what you want to accomplish. Email is fine, or we can talk on the phone. Between what you offer and the answer to questions I will ask, I can usually get to the point where I can say; "At least x sessions..."
I want to give you an exact number just as much as you want that number, but anyone who quoted a number for me without knowing the specifics about me would immediately raise my suspicions.