Matt Reeves started working on The Batman on February 2017. Over 8 years ago.
Between June 19,1989, through June 12 1997, a period of (a few days under) 8 years, we had 4 Batman movies. Now, that's not counting 89's preproduction, which was tumultuous, but in earnest really kickstarted only a year before that, in 1988, after many unused scripts.
Why the fuck are movies taking so long now.