How long do Twitter search engines remember?

Less than a month ago, I tweeted
and it’s still online as a Twitter status. I search Twitter occasionally, and I’m often interested in Tweets that are more than a month old. This tweet was forgettable, but the words are unusual enough that it should be easy to find.

So it’s a good test:

• It’s no longer in Twitter search;
• Google finds it; and
• So does Tweefind (under Related News, in the sidebar on the right).

Other services which work via Google also found it. I wonder how longer Google will have it.

If you can find this Tweet in any other way, please comment.