Its 90% lightning. I become possessed. I did this in about 3 hours total work time, but it took me a month of mulling the idea around in my head for it to come out.
I spend a little bit of effort organizing my pieces. Usually the subject is pretty narrow so organization is not a big deal.
Timewise, I might spend a lot of it editing. But this part is mostly mechanical for me, so I can put my brain on the back burner.