How Long Does It Take To
Get Into the Google Index?

"There is no set amount of time it takes for Google to find a new site.

The Googlebot regularly crawls the web to rebuild our index. By using Webmaster Central, a webmaster can see how frequently his site is being crawled by the Googlebot and tell Google whether it should be crawling faster or slower."

Source: Making the Most of Your Content: A Publisher's Guide to the Web, available from the Google Web site.