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As measured in seconds or fractions thereof, the length of time taken by a moment of stuttering. Some clinicians have chosen to emphasize the average duration of certain moments of stuttering, such as the average duration of the longest, and/or shortest moments of stuttering, within a specified speech segment.

Definition reprinted with permission from Hood, Stephen B. (editor) available from Stuttering Foundation of America: Stuttering Words (Publication No 2: Speech Foundation of America)