For me it took about 32-34 years. However I did have counselling as a 15-16 year old, but the counsellor didn't ask about abuse. If she had asked about abuse I might have denied it.
One afternoon I went with my mother while she had a conference with my T. I was not invited. However, I snuck up to the door unseen and unheard. I heard the counselor ask my mother: "Why don't you love your son?" I heard her answer weakly: "I do". It wasn't very convincing.
"I only got indirect hints later that they (the T and the team she was with) must have called my parents in for conferences. The hints were in the form of changes in their behavior. They started trying to do nice things for me. Once they gave me the credit card and told me to buy anything I wanted!! I only bought one shirt (was I dumb?
). They asked what was my favorite food and took me out for thick milk shakes, etc.
The first book on child abuse (Kempe et al.) to appear in the United States came out a few years after my teen counselling in Denver. I have wondered if there was a connection.