Editing vs Writing

I'm now learning a lot about editing. It's a distinct skill from writing. Here's how editing's different from writing, in my experience:

I can't really schedule or predict writing fiction. I might sit for nine hours, produce no worthwhile text, go to bed, wake up and write a thousand usable words in an hour that then take little or no rewriting.

Editing is different. Doing it is like a 9-5 job. I can pretty much tell how much I'm going to "process" over what period of time. This first stage is going to take 6 hours a chapter, by the rate I'm going. I'll maybe get faster with practice. I could also, productively, work overtime, which I've been doing.

Writing surprises you sometimes. With editing, though, there's more rote work. I can't call it boring, I have to make a lot of decisions, but setting it up so I can make the best decisions takes most the time.

My deadline in October seems pretty tight right now.