I havent heard of this before and generally know that if you arent better by the end you should be offered various things.
I know that some psychotherapy is time dependant because it is so specific that each week will have an agenda etc. Then at the end of the 15 sessions it will be assessed to see if its been beneficial if so then it could continue for a few more session if not then it will be stopped.
What I would say is that it is really important to try and get the most out of this and look at the positves of having 15 sessions and what you can achieve from it then worrying about the end of it all.
I think it is an important point to bring up when you meet because it will put you at ease either way.
xoxox
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