This is how I can spend a week not moving forward on my screenplay.
Monday - I'm in a flurry of prose and lay down 10 pages of dialogue for a bar scene. I own it Man!
Tuesday - I reread bar scene and GAH! Real people don't sound like that! So time to rework it. It's now only 7 pages, but it's more concise and to the point. Wednesday - Reread scene again, arrgh. It doesn't make any f**king sense at all. Edit edit. Edit. Now only 4 pages.
Thursday - Reread and wonder, what the Hell am I doing? My wonderful dialogue has nothing to do with the story.
Friday - Zero pages, start over.