When I watch a long movie, more specifically an Epic, I know full well that I am going to spend a disproportionate amount of time on this adventure, so I usually shift gears, sit back and just accept the fact that I'll be here for a while. As a result, I end up checking the time less often, and therefore the movie sort of FEELS faster.
With Anatomy of a Murder, I actually didn't even know how long the film was going to be, yet it managed to keep my attention anyways. It didn't require me to settle into a mindset, but it kept me intrigued with the solid storytelling and all things in between. It looks and feels just like any other crime movie for the whole runtime, which I believe gives a sense of familiarity.
The film is just really good. While the ending could've been better, the majority of it is a delight regardless.