premise: The SCCA National Sports Car Championship was a sports car racing series organized by the Sports Car Club of America from 1951 until 1964. It was the first post-World War II sports car series organized in the United States. An amateur championship, it was eventually replaced by the professional United States Road Racing Championship and the amateur American Road Race of Champions.
hypothesis: The SCCA National Sports Car Championship lasted for at least 12 years
reason: The series lasted from 1951 until 1964 which is 13 years. It was difficult because the AI is not good at math