Long fights: it's a balance. While you might want a fight to be complex and longer, the longer you describe it blow for blow, the more stilted and mechanical (and borings) it becomes so internal commentary and thoughts on the fight along with feelings are as important. On the flip side if you start padding it with too much internal thoughts and feelings and metaphors, it loses pace and there isn't any intensity.
Long chapters: again, it's a balance. Depends entirely on your audience and your platform, but also your story. Don't hit an arbitrary word count just because you think you should and don't chop things off just because you think you should.
Dialogue can be funny depending on when and where you learned it. For instance, some places an coma around the tags isn't accepted as correct, in others it is, like so:
"It's just," she says with a tilt of her head, "why would they bother if they weren't after something?"
Correct where I am and for my age, but a lot of my beta who're younger or from other countries don't like it. In your example, your dialogue tag should be with the text.
"...short amount of time?" Marco asked Har as he slowly started walking around him.
Har laughed.
More like that is better because it puts telling you who's speaking in the same place as the speaking. A good rule of thumb is that every new action is a new paragraph. Macro asked while walking around her. New paragraph because Har laughed.
Also, you don't seem to have any full stops/periods. Full stops/periods are breaths. Try reading everything you wrote in that first paragraph one breath, it doesn't really flow well, does it?