How long does a searchid stay available. For instance, on a thread I had replied with a link to the search page where I had done a search, the link was like this:

http://www.vbforums.com/search.php?searchid=684917

How long would this link last? Since I dont see any search terms in the query string on the link, I assume this is only temporary, unless it somehow knows the search terms by that magical number hehe....