Conversation so far:
How does Artificial Intelligence come into play with Herbert A. Simon?
Herbert A. Simon was a pioneer in artificial intelligence, creating with Allen Newell the Logic Theory Machine and the General Problem Solver programs using the Information Processing Language.
What was Simon Herbert's Logic Theory Machine?
Logic Theorist is a computer program deliberately engineered to mimic the problem-solving techniques of a human being and is called the first artificial intelligence program.

Question: How long did the language take to develop?
Self-contained rewrite: How long did the Information Processing Language take to develop?