Already, actually. I think Google spiders me multiple times a day, but almost certainly at least once a day; the post about the hex tile was on google after less than 15 hours, and this one after about 8.
Not sure if you know this already or not, but you can actually set some coarsely-grained control over things like how frequently Google indexes your pages using their Webmaster Tools (http://www.google.com/webmasters/tools/). It will also give you stats about which search terms are driving traffic to your site. That by itself is something a good log file can do, but the Webmaster Tools also gives you things like a break down of how GoogleBot is ranking your keywords and your site's PageRank. Personally I have no practical use for these tools with any of my sites, but it's an interesting glimpse into how Google perceives you.