unfortunately i have a site and i think it in sandbox, is there a known method, which let you get out of sandbox in short of period of time? any suggestions.
You can definitely try changing your content and making sure none of your content is duplicate. Use copyscape to make sure that your site is clean and then resubmit your application to Google via webmaster tools for their reconsideration. That should help.
Just to set your expectations right, some sites do not ever get out of the sandbox. I suggest you get in touch with Google and check with them on how you can get your site back into the SERPs. I suggest you post quality content on your site and make sure to engage your users through social media sites. It would help a lot if your content gets shared by other users in social media sites. Hope that helps. Have a good day!