That's a hard call. Especially since we don't know how exactly Selina fits into the story, or how Miranda fits into the story... its possible that Miranda has more time than Selina... or that Bane is only a minor character... which would be abusrd but also very possible....
I believe Bruce and Bane will have the most amount of screentime. Joker and Ra's didn't really have that much screen time in TDK and BB.
But I feel like in this closing of Bruce's story and the parallels that Bane has to Batman, Bane will have much more screen time than previous villains. The Joker is the Yang to Batman's Yin but Bane is a broken mirror of Batman. He's Batman gone wrong and I feel Bane will partly be used to close Bruce's story.
But I think Selina will be a big factor also so my feeling is: