Divorce papers in the USA

I'm doing some research for a future story and would like a little bit of help.

How long would it take to prepare a set of papers for a divorce? If the side petitioning for the divorce knew what they wanted before contacting an attorney, how long before they could get the application for the divorce? I would like it to be pretty short.

I need this to work on the timeline for the story.
Thanks,
Samantha