90% of the time, TV Shows are way too long. In the age of binge watching they're dragged and stretched far beyond their breaking point and it's so rare that they ever stop where they need to. It's one of the reasons there's so much quality British TV from the past, it rarely outstays its welcome. You can watch the entirety of Spaced in 6 hours.
Every time someone recommends a show to me and I see that there's already 6 seasons with 13 50+ minute episodes per season, I'm immediately turned off. It's too much time for a passive hobby for me, when in that time I could watch 7 entire short movies, each of which has its own build up and pay off, rather than dragging that feeling out.
Don't get me wrong, I've seen plenty of long-form shows and many are incredible, but these days I have less and less interest in them. It takes something really special for me to want to continue investing that time. Twin Peaks S3 is one such example, and ironically, that's a show that greatly suffered in S2 from executives meddling and demanding the season be more than twice as long as it should have been.
Miniseries like Chernobyl are where it's at. In other hands that show would have been 3 seasons long and terrible. At 5h 20m it was fantastic.