Sūta said: The aṃśaka, therefore, is one-sixth of the duration of each yuga. The period of duration of Tretā, Dvāpara and Kali is respectively three thousand, two thousand and one thousand years without their aṃśaka parts. That of Kṛta has been mentioned above. O men of holy rites, fifteen winks in the eyes of a man of normal health in normal condition constitute a kāṣṭhā. Thirty such kāṣṭhās make one kalā. Thirty such kalās make one muhūrta.