Redundancy: why say it twice?

Have you ever sat through a meeting that went overtime because people repeated themselves so often? In the first part of the meeting, the leader did not repeat herself, and the other people did very little repetition. In the second part of a meeting today, a new leader repeated herself frequently, and others did as well.

One tip for reducing this is to make your own comments very short, in the hopes that others will copy your verbal behavior. What are some other techniques people can tactfully use in American meetings?