If i change the Meta info of a page.....when can i expect to see the changes show in the search results. Is there a way to force the google bot crawl my site? Or do i just need to wait and see?
It would depend on the authority of your site and how often you normally make changes or add content to your site. You could try resubmitting your sitemap to Google webmaster tools. Getting some new quality backlinks may help speed things up too.
It could be anything from a couple of days to a couple of months if your really unlucky ! build a few related back links directly to the page your targeting.