Long live the movie
Black Panther has a long runtime. It clocks in at 135 minutes, which is apparently longer than any other Marvel movie that has a single superhero in it. But think about it: Black Panther doesn't have the same name-recognition that Cap has. Black Panther is fewer than ten minutes longer than Iron Man, and Tony Stark lives in a world we all know or quickly recognize. Sure, GotG was new for a lot of people, but it was sort of, "Here's the 80s - now everything else is not as you know it." Pretty cut and dry. Wakanda exists as part of our world, so it's more important to make minute distinctions so audiences are acquainted with what's the same and what's different.
If you so desire, you can track the movie runtime and also pay tribute to a king and superhero with your Black Panther Logo Watch. With a sleek matte black case with a faux leather band, this watch features Black Panther's mask in glossy black on the face. And check your watch before you shout "Long live the king!" so people know you're tracking exactly how long. Actually, that sounds kind of morbid, doesn't it? Scratch that. Just use it to time how long it takes to run out and get another small popcorn.