I'm in the deepest parts (I think) of my therapy right now. I don't know how long I'll be in it but I know we're coming to some really important realizations. Termination gets me all balled up. My fears/anxieties about it started 2 months in (i'm at 6 months now.) My T and I talk about it a
lot. To try to calm my fears he's told me two things that helped.
Some people can terminate in one session easily. Others (like me) develop a bond with their T in which the relationship was intrinsic to the healing (for example, I came because I have social anxiety and I really struggle to make friends and be emotionally intimate.) He explained that for these people, termination takes a long time by comparison. Sometimes several sessions, even over the course of months (say, 1 session a month for 2 months.) He says that during this transition period I might freak out and say "not yet" because I am in control of the ending. But he gently reminds me that therapy will not and can not last forever.
He also told me that when my time comes it might be helpful to make something together (but he never said what that meant (

dying to know what that looks like) or exchange very small, meaningful gifts.
I had no idea I would get attached to my T, as this is my first go at therapy. This attachment has been the most difficult aspect of therapy for me.
I think what I'm trying to say is that not everyone will have a single closure session. It seems to me that mine will take several weeks and my T has assured me that's okay for some people.