A 1 hour speedup for construction is an item in Evony TKR (The King's Return).
The description of 1 Hour Speedup for Construction in Evony TKR says:
Reduces remaining time on a construction timer by 60 minutes.
1 Hour Speedup for Construction is known to potentially be obtainable from opening Senior Spring Festival Rewards, Medium Spring Festival Rewards, Junior Spring Festival Rewards, Lv11 Boss Monster Chest, Lucky Box Ⅲ, Lucky Box Ⅶ, Junior Lava Turtle Chest, Junior Witch Chest, Pile of Speedup and Common Ymir Chest. The links for each item are below:
Note: This list may be incomplete.