As Dragons Flight broadly said, the Primate Order is thought to have arisen as long as 85 million years ago, so one could say that it took the Primates at least 83 million years to evolve " intelligence " ( depending on your definition of it ) : equally valid might be a comparison between Dinosaurs and Eutheria, the Infraclass of non-marsupial mammals to which Primates belong, which is at least 125 million years old.
