Like people have said, usually 5 - 10 minutes. Though it normally lasts longer with comics like Lazarus where the letters section is full of interesting stuff. Really makes me feel like I'm getting my money's worth.
I know this is getting cliche, but Heath Ledger's Joker. Unlike the other comic book movie villains - who had a solid, reasonable motive - Joker didn't want anything other than to cause chaos. And, like his comic book counterpart, he didn't have a definite back story. Which makes both the comic book and film version more interesting and unique, IMO.
I know @inferiorego has worked/works at a comic shop. He may be able to help you.
I think I might be able to answer some of your questions, though.
I would say there has definitely been a burst of interest in comics since Marvel Studios started bombarding the public with comic book movies.
I think some of the most difficult things for people looking to get into comics is that they have no idea where to start. Reboots like the New 52 and Marvel Now cleared some of this up, but new readers can still get a little overwhelmed.
As far as suggestions; just start with a character you're interested in - Superman, Batman, Spider-Man - find something that catches your eye and ask about it here.
But if you're looking for a different genre Image is where it's at. They've got quite a range of comics to choose from. Lazarus, Death Vigil, Wytches and Birthright are currently some of my favorite non-superhero titles.