Alright, I just timed The Joker in B89, and it's pretty interesting. I'm not going to get as in depth the same way I did in the
Bat-screen time, but The Joker has 29:48 of screen time, compared to Batman's 26:51. Yes, he had more screen time, but not nearly as much as people exaggerate. About 3 min, not 10-15 min like people act.....
I actually think that The Joker in TDK has much more screen time than Batman. I'll actually time that later, but I think it's true, due to the fact that he's The Joker from square one, whereas in B89, there was a transformation taking place.