Days to 600 million:
Titanic: 252
Avatar: 47
The Avengers: probably between days 40-50
Good point. Look at Blade. That is not even a B-grade Marvel character. But if you get the right actor, right story and it is done well, a good quality film can emerge. The first 2 were great, the 3rd was ok but Ryan Reynolds saved it imho.
Marvel has a massive amount of potential huge franchises to convert on the big screen: namely
Alpha Flight
Excalibur
X-Force
The New Mutants
The New Warriors
X-Factor
The Midnight Sons
Sinister Six
Thunderbolts aka Masters of Evil
Brad Bird- he did Iron Giant, The Incredibles, MI:4. That is an impressive resume. My next choices to film a marvel franchise would be
Ridley Scott (anything), David Fincher (anything), Quentin Tarantino (Deadpool), Tim Burton (he could do Morbius or something else dark lol).
Writers: Joss Whedon, Christopher Nolan, Alan Moore, Neil Gaiman, Frank Miller, Warren Ellis