I'd agree, they're getting too long. And it's not just TV shows, it seems like big movies and games are also too long too often.
It's like every major work thinks it's the be-all culmination of human creativity. For the people who work on it, it may have that place of importance. But as a viewer, any given work is, by default, just yet another in a huge sea of art that might occupy my time.
But also, I get it. When you find something you really resonate with, that you devour each second of, sometimes it can feel like the longer the better. You almost don't want it to end. And if you pay money for something, and it's surprisingly short, that can feel disappointing.