27 catur-yugas

27 catur-yugas Brahma laughed loudly, and explained that time runs differently on different planes of existence, and that during the short time they had waited in Brahma-loka to see him, 27 catur-yugas (a cycle of four yugas, totalling 108 yugas, or Ages of Man) had passed on earth (see time dilation theory). Brahma said to Kakudmi, http://wapedia.mobi/en/Kakudmi