What is the sense of «أيام» in «أَيَّامٍ لَنَا غُرٍّ طِوَالٍ»?

ʿAmr ibn Kulthūm: Address to Abā Hind, Tribal Pride and the Mill of War (Verses 23–38)

• Strictly seven weekdays
• Memorable tribal episodes or conflicts
• Mathematical moments
• An ordinary weather forecast