A 8 hour speed up is an item in Evony TKR (The King's Return).
The description of 8 Hour Speed Up in Evony TKR says:
Reduces remaining time on a timer by 8 hours.
8 Hour Speed Up is known to potentially be obtainable from opening Lv10 Boss Monster Chest, Bulk of Speedup and Mass of Speedup. The links for each item are below:
Note: This list may be incomplete.