A 3 hour speedup for healing is an item in Evony TKR (The King's Return).
The description of 3 Hour Speedup for Healing in Evony TKR says:
Reduces remaining time on a troops healing timer by 3 hours.
3 Hour Speedup for Healing is known to potentially be obtainable from opening Medium Lava Turtle Chest, Medium Witch Chest, Medium Warlord Chest, Bulk of Speedup and Uncommon Ymir Chest. The links for each item are below:
Note: This list may be incomplete.