system
Given the following post, respond as if you're commenting on Reddit:
human
[40k] When space marines fight other space marines (such as chaos space marines) are the fights short or long?

Being some of the deadliest foot soldiers in one of the deadliest fictional worlds do space marine battles tend to be long drawn out affairs or are they sudden and furious with one side dead within minutes if not seconds?
gpt
Depends on the situation and the Marines involved. Some are trained in lightning fast hit and run tactics like the White Scars or Ravenguard, others are trained to dig their heels in and stand the line until the last man like the Imperial Fists. A fight between the Imperial Fists and say the Iron warriors might take *weeks* of prolonged siege as they're both prone to digging in and fortifying or trying to break fortifications, whereas something like a World Eaters versus White Scars fight might be decided in a brutal melee that lasts like twenty minutes of stabbing and punching.

It's mostly down to doctrine when it comes to the Astartes.

If we're talking just one on one, it tends to be brief and based around who screws up first unless it's named characters, in which case it's anyone's guess.