A 3 hour speedup for construction is an item in Evony TKR (The King's Return).
The description of 3 Hour Speedup for Construction in Evony TKR says:
Reduces remaining time on a construction timer by 3 hours.
3 Hour Speedup for Construction is known to potentially be obtainable from opening Bulk of Speedup. The links for each item are below:
Note: This list may be incomplete.