URL: this is the thing that begins with http:// that people type in to get to your page
Keywords to search for: these are what the script will search for when looking for your page.
Time:
While the actual time it takes per search engine varies greatly, you can probably expect each search engine to add about 5 seconds. While this is considerably faster than doing it by hand, it does tend to add up. In short, if you leave all 0 search engines checked, you can expect it to take about 0 seconds or so.