I added a site to Google Webmaster Tools about 15 days back. How long before the Top Search Queries is reported? Even after 15 days, I am getting the message:
you just recently added your site. it wont reflect any data yet. wait until you have sufficient traffic for your website.
Depending on the site, it could take several weeks to several months. If there's one thing you need when catering to Google, it's patience (unfortunately).
It depends on the site. I added a site and the phrases appeared immediately. Is your site new? Are you getting traffic?
I think your referring to Google ANALYTICS, not google webmaster tool...because once you verified your site in webmaster, it will instantly send statistics to google...
the site is more than 2 years old and gets almost all its traffic from Google. and I am definitely talking of Google Webmaster tools.
I know this is a stupid question but I have to ask... you inserted the google script code in the index page, right? It seems unusual that the results aren't showing after 15 days..
Just keep increasing your back links, and as much as links pointing to your website found by Google, it will surely start shows results in Search Queries. Wait for a week, but don't wait for generating back links.