Bhagavad-gita As It Is

by A.C. Bhaktivedanta

Kṛṣṇa descends to this planet once in a day of Brahmā, or every 8,600,000,000 years.

Krishna Vibhava avataram once per Kalpa and if so was it during current Vaiwasva Manvantra 28th Chatur Dwapara Yuga?