No, movies aren't "becoming long nowadays", your attention span just sucks.
I hear it so much lately for films that are 120 minutes long. Long movies have existed since the silent era and no one complained. "Intolerance" came out in 1916 and is known as one of the greatest movies of all time. That doesn't mean that specific movies can't be too long, but to say they've generally gotten longer is an outright lie. Put down your phones, stop watching Tiktok videos and you'll feel so much better watching long movies you otherwise would have missed.
Just be honest with yourself and say that your attention span can't handle long movies. Movies haven't suddenly become longer, you've just been on your phones or playing games for too long.
Rant over.