Even with finding the right starting point, 15 hours could easily be filled with parts or chunks of Sinatra's life. Scorsese says he loves the idea of a Sinatra miniseries, especially at HBO; "as long as you stay reasonably on budget, you have freedom which is very difficult to find in the cinematic marketplace."
As for who will play Sinatra, Scorsese agrees that Leonardo DiCaprio (with whom he is making "The Wolf of Wall Street" later this summer - the fifth pairing of the director and actor) could do it, and has "always talked about doing it." But, Scorsese adds: "We could go for an unknown. Maybe the person who plays him isn't important." It will be Sinatra's voice either way.
A Sinatra biopic would always be "filled with problems," Scorsese admitted. "And whatever you do, there's always going to be people who don't like it, so you have to find something special. And I think I've found it. Now's the time to execute it on the page."
Here's more on why we're thankful for Scorsese.