A 30 minute speedup for healing is an item in Evony TKR (The King's Return).
The description of 30 Minute Speedup for Healing in Evony TKR says:
Reduces remaining time on a troops healing timer by 30 minutes.
30 Minute Speedup for Healing is known to potentially be obtainable from opening Medium Alliance Boss Package. The links for each item are below:
Note: This list may be incomplete.