āsīt - was; tat - that; aṣṭā-vimśa - twenty-eight; aham - days; itara-itara - with one another's; muṣṭibhiḥ - fists; vajra - of lightning; niṣpeṣa - like the blows; paruṣaiḥ - hard; aviśramam - without pause; ahaḥ-niśam - 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.