Well, it's not 3 hours (the Wikipedia page lists a 42 minute running time), but you might be interested in In Saturn's Rings, a documentary nearing release made

Well, it's not 3 hours (the Wikipedia page lists a 42 minute running time), but you might be interested in In Saturn's Rings, a documentary nearing release made using only photographs from space missions: http://www.insaturnsrings.com/watch/ http://www.insaturnsrings.com/watch/ http://www.insaturnsrings.com/home/ http://www.insaturnsrings.com/home/ (with another teaser video not on the "watch" page)