The difference between roleplaying and creative writing really depends on the specific environment and whether it focuses on writing/storytelling or action/quick emotes.
Personally? Even though my games focus on writing, I still don't like to drag things along too much. How elaborate I get depends on the situation: In action sequences, I most certainly keep things brief, concise but as colorful as possible. In more dramatic situations, and especially with fewer people involved in the scene, I may take longer. But I do try to limit composition time to no more than a few minutes.
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