How To Remove URL from webmasters in “Fetch as Google” section?

In Google WEBMASTERS,
Unfortunately i fetched few URL's which i don't want to index! after that i placed same URL in "Remove URLs" section even though those URL's still persist in "Fetch as Google" section and my question is how to remove those URL's else Google will automatically remove it? if yes when it will remove?

See original post by Ijus