Requesting feedback from people who rewrite articles/content

1) When you rewrite an article, how many unique versions do you typically want to generate?

2) About how much time are you willing to spend configuring a seed article in order to get the number of unique copies given in response to question 1?

3) What is your primary use for content rewriting? Article directories, or for your own blogs, etc?

4) What abilities or features would you like to see in a unique article creation tool that doesn't exist in other software you've tried?

Thanks for any/all responses!