Question: Srila Prabhupada in his purport to Bg 8.17 gives in detail about the lifetime of Brahma (i.e. about yuga, Manvantra, Kalpa and so forth). Can I get the actual reference to these statements?
Answer by Romapada Swami: The calculation of Vedic time scales is described in great detail in Srimad Bhagavatam, Canto Three, Chapter 11. Specifically see 3.11.18, 19, 22 & 23 for above definitions.