sˈɛvɹəl ɹᵻsˈɜːtʃɚz hæv nˈæɹoʊd ðə pˈiəɹɪəd ʌvðə pˈʌls tə bᵻtwˌiːn θˈɜːtiːn,fˈaɪvhˈʌndɹɪd ænd fˈoːɹtiːn,sˈɛvənhˈʌndɹɪd kˈæləndɚ jˈɪɹz ɐɡˈoʊ wɪð ɪts pˈiːk æɾ ɐbˌaʊt θˈɜːtiːn,ˈeɪthˈʌndɹɪd kˈæləndɚ jˈɪɹz ɐɡˈoʊ.
Several researchers have narrowed the period of the pulse to between 13,500 and 14,700 calendar years ago with its peak at about 13,800 calendar years ago.