I have a quick question! I have implemeted robots.txt to disallow some of my pages! How long it will take to do this? whether i can get all my pages OUT OF INDEX all at a time or it will happen pages by pages. I'm confused
It depends on your site. Sites that are crawled more frequently will see results faster then sites crawled less frequently. If you want pages removed from the SERPs quickly robots.txt is not your best option. Use a removal request instead.