No, movies aren't "becoming long nowadays", your attention span just sucks.

When movie is interesting - people wont complain that its too long. They wont notice time.

Problem is that now movie makers make long movies for no reason when script does not require it. And there are too many slow and unnecessary scenes. Or boring fake cgi nonsense or fights that go nowhere.

Movie should be around 1 hours 40 minutes long. No one needs 3 hours movies.

in the spirit of attempting to be open minded, the first movie i'm watching today is going to be 'what do we see when we look at the sky?,' some endlessly long movie out of georgia (the country) that actually looks like it has an interesting premise. and is 171 minutes long ffs.

wish me luck.

it's only ever about how good the story is. story and plot are about it's motion forward.
if we get to hear that batman wasn't breastfeed as a child, that dam well better be affecting the story/plot in some motional way, otherwise it serves zero purpose.

you can develop character while the plot pushes on, not going to point out all the great movies that do this already, there are too many.

my attention span is great. i'm old, I can watch new short ASL films, and well as old classics that are slow and drag on by today's standards.... IF the story is good.
If you notice how long a film is, they should have edited it down to the 2 hour mark, and left their ego in the car.

Depends on the film. I thought the Transformer films were overly long and a lot of the Marvel films are too long as well. They just draw out these pointlessly long action scenes. You wouldn't think action scenes would be boring but they make them so.