Day 60, 12:00, for 24 hours: 171 zombies at ×13 health and ×11 attack.
Part of Endless tier 12, day 5 of 5.
When it ends:
Scrap Metal×4
Broken Glass×3
Door Repair Kit
Window Repair Kit
All-Purpose Strengthener
Fine Sheet Metal×2
Electronic Components×2
Instant Spicy Hotpot
Inspirational Story (Endless rewards, tiers 10-14)