We crawl continuously. We look to be updating our store [of information] within 20 minutes of when a page [on some other Web site] changes. We’d be happy to answer two or three questions per minute that are very complex and change how business works. BW Online | May 6, 2004 | Web Search: On to “Sense-Making”

A quote from the WebFountain guys (emphasis mine). Remember: we do search because it helps solve problems.