When writing short stories, I focus on the plot, characters, and the setting of the world I’m creating. I tell it as well as I possibly can in the moment, and devote time afterward “polishing” that first draft.
On most stories, it typically takes me two to three days to reach the second draft phase. From there, it depends how much more time I’ll tinker with it.
Am I completely satisfied with it? If yes, then I stop and submit the piece to a market.
If not, more tinkering…