Any speech synthesis and speech recognition system has the algorithm which defines pause duration. A pause is an important member of prosodic cues used among other components -- pitch changes, prepausal lengthening, declination reset -- for boundary markings and thus for structuring the text into intonation units. We know that the speakers use variable combination of prosodic cues to mark boundaries between different syntactic or discourse units. What prosodic cues are of primary importance for the speaker to mark boundaries of different strength and to highlight the structural make up of the sentences in the text -- these issues have been the subject of intensive research. Some studies have shown than syntactic boundaries are characterized mostly by pauses [1,2,3] and lengthening [2,3,4,5,6], sometimes also pitch [7], some claim tham the interaction of prosodic cues is a mode complex one [8]. Is this study we investigate the role of a pause as one of prosodic cues used in marking syntactic boundaries in the Russian text.