Question about duplicate content

i create a website and i copy paste an article. My question is if i remove that article and post fresh unique content, in how many days google wil crawl it. and after remove that duplicate article is it alright to work on that website i mean will it rankable ?

There is not a fixed amount of days in which Googlebot will crawl again your website. In your Google Webmaster Tools account you can find how frequently Google crawls your site. If you didn't receive any penalty (again, you can find in your Google Webmaster Tools account), your new unique article will be indexed and you are ok to work on that site.