When you start seeing numbers like "6" after certain movie titles, as is the case with the recent smash "Furious 6," it really begs the question: "How much longer can this go on?"

The answer is an infinity symbol (∞), and if you don't believe us then take a look at this infographic that displays the longest-running franchises in Hollywood history to date, the ones that just didn't know when to say "Enough."

Sure, we had to include weird stuff like the theatrically-released "Star Wars: The Clone Wars" movie and the doofy Adam West "Batman" movie from 1966, though both their respective series (and just about every other franchise on the list) have more installments in store, bet your bottom dollar.

Click on the image below for a larger version.