The goal of this paper is to investigate vocalic hesitations in Estonian and compare them to the related vowels of overlong (Q3) quantity degree. We wonder if there are some languagespecific characteristics of hesitations. If yes, which kind of characteristics can be observed in Estonian language? We analyze duration, fundamental frequency (f0), intensity, and first two formants using 39.5 hours of manually transcribed monoor dialogue speech from a spontaneous speech corpus. Investigated vocalic hesitations and Q3 vowels are: /ee, ̈a ̈a, aa, , ̈o ̈o/. The characteristics of hesitations as compared to those of Q3 vowels show that hesitations have longer duration range. Hesitations generally include lower f0 and intensity values. However, the values vary in terms of vowels. First two formants of hesitations tend to be located at more centralized positions in a vocalic triangle than related Q3 vowels.