Bernstein analyst Carlos Kirjner has taken a deep dive into YouTube. And what has he determined? The online video site owned by Alphabet (GOOGL) is on a path to become one of the largest media businesses in the world, with more than 1 billion people spending 40 minutes a day on the site. And assuming that “time spent is indicative of monetization potential and value,” the YouTube could be worth $67 billion and $86 billion, says Kirjner.