I am not a fun of drafts, i just write, edit, edit even more and publish. I have heard writers proposing that you should have different versions of the same story as drafts! That is like 3 -4 totally different stories.
What is your routine?
Well, I am still a novice writer so I am not aware how many drafts are written by professional writers but I guess it will be very difficult and time consuming to prepare so many drafts, specially when the story is a bit long.