asit -- was; tat -- that; ashta-vimsa -- twenty-eight; aham -- days; itara-itara -- with one another's; mushtibhih -- fists; vajra -- of lightning; nishpesha -- like the blows; parushaih -- hard; avisramam -- without pause; ahah-nisam -- day and night.

The fight went on without rest for twenty-eight days, the two opponents striking each other with their fists, which fell like the cracking blows of lightning.