What are the advantages of Timeboxing for the Daily Scrum?

Hi,

I've been reading about the advantages of timeboxing in Scrum. I found that this article explained it well. Though I cannot see how those advantages apply to the Daily Scrum. Why should a Scrum Master ensure that the Developers have the Daily Scrum in the 15-minute timebox proposed by the Scrum Guide? What arguments back-up this timebox?