[Script] When is it finished?

Let's leave aside that I still re-edit hopeless and episodes of lovebites in my head 5+ years later. Eventually you have to send something you've written out into the wild. I guess I have three measures that let me know the time is right:

1) I can visualise how a scene needs to be shot.
2) I really want to film it.

And most importantly

3) When I read it from start to finish, I'm absorbed - taking hardly any notes.

What about you? Any rules of thumb for when something you've done is finished?