A 8 hour speedup for construction is an item in Evony TKR (The King's Return).
The description of 8 Hour Speedup for Construction in Evony TKR says:
Reduces remaining time on a construction timer by 8 hours.
8 Hour Speedup for Construction is known to potentially be obtainable from opening Mass of Speedup. The links for each item are below:
Note: This list may be incomplete.