misterjinx - 3:49 pm on May 15, 2010 (gmt 0)
Hello I did some scientific tests in italian language from October 2009.
A single retweet from a trusted Twitter account make indexed the site within few hours (less than 16, also 2-3 hours at max).
Please also note that Google in real time search snippet expands the url shortened and displays the title of the linked page.
When I did tests I also noticed that for the first 7-10 days after indexing you had the tweet and linked page in SERP.
I think they were considered as a single entity because the tweet and the linked page were coupled (for example in #13 you had the tweet and in #14 the linked paged, and so on).
After the 7-10 days the tweet and the linked page started a different live in SERP: they separated and changed indipendently their position.