Abstract: This study investigates the relationship between speech tempo and the duration of epenthetic schwa in Dutch. The speech materials consisted of the spontaneous speech of 160 teachers of Dutch: these speakers were equally distributed over four different regions in Belgium and the Netherlands. There were an equal number of men and women. The research focus was on 750 words which contained a consonant cluster with r as the first element and a non-alveolar consonant or n as the second element. These words consisted of two or three syllables after schwa insertion (e.g., werk ‘work’ > [wɛrək], werken ‘to work’ > [wɛrəkən]). The speech rate of these words was calculated and the duration of any inserted schwa was measured. As predicted, the results show a clear relationship between speech rate and the duration of schwa: faster speech yields shorter schwas. Besides this general trend a statistically significant effect was found of geographical region, the number of syllables, the place of articulation of r and the second element of the consonant cluster. In addition, there was a significant interaction between speech tempo and the schwa duration in men and women: women produce shorter schwas in faster speech, while their schwas in slower speech are longer than those in men. As such the durational differences in schwa are more outspoken in women than in men. This can be accounted for by the general trend that vowels are generally longer in women’s speech. The shorter schwa durations in women’s fast speech may have to do with the fact that it is easier for women to bridge articulatory distances as a result of smaller oral cavity volume.