I've blocked an entire "work in progress" site from showing up in Google (I was too lazy to make the robots.txt file for it, until I noticed that it was showing up on Google and getting some traffic)... I quickly put the robots file up. A day later, I've seen that the site is still showing up in SERP's. How long will it take to be removed??
depends on how often google indexes you. it should not take too terribly long. however, google has a tool to request tool. Search google for: google url remove Go to the first link, titled "urgent removal request" that should help you out.