In my limited experience, each story is different. Some seem to write themselves, and others seem to require Herculean effort.
I think as the writer you will know when it's ready...the trick is listening to THAT voice. The critical editor will always tell you it's trash. But there is another voice that says, "This is good."
My current short has been quite a ride. I was in love with the original idea. Loved it when I wrote it, BUT I didn't want to show it to anyone, which is not like me. I couldn't figure it out. Finally, I shared it with my writing partner who said, "It's good, but you can do better." And basically told me to torture my MC. I knew he was right, but I didn't want to do it. I did it anyway, I changed the ending to something less predictable. Went back and changed fixed some of the lazy (read: impatient to be finished) writing. And NOW it is almost ready, and I can't wait to share it with others.
The point of this is...if you are like me, rushing will lead you to trying to let go of a story before it is completely ready. Take the time your story needs, and make it something you can be proud of.