lorax - 1:08 pm on Jun 21, 2013 (gmt 0)
Welcome to WebmasterWorld Minglekart!
You can't actually "schedule" a crawl. You can set variables that Google will read that tell Google what your crawl preference is. Create and/or log into your Google Webmaster Tools account and look up crawl rate there.
Here is some additional information on WebmasterWorld regarding crawl rates and Google [google.com]