It's an accepted rule of scriptwriting that in a film, two minutes is a long scene, and three minutes is probably too long unless you're going to break it up with some serious action. In soap opera, scenes are often under one minute. You need to keep up the pace or audiences will get bored.
On the stage, you can run to ten minutes quite easily. In fact, it's perfectly possible to do an entire play in a single scene. That's one of the things that makes plays "stagey".
But what about short films? I've got a script that involves just two people, talking together in a room. It takes me about seven minutes to tell that story with dialogue and get across the characters, the situation, and the plot. Despite rewrites, I can't cut it down any further without losing something vital. I've tried adding in a different scene I can cut to half-way through, and that doesn't work. I've run out of ideas. The scene is what it is, and it don't wanna change. That makes it far too long by standard "film" rules. But do shorts have different rules? Is a seven minute scene OK if that's all there is to a film?