A 10 minute speedup for training is an item in Evony TKR (The King's Return).
The description of 10 Minute Speedup for Training in Evony TKR says:
Reduces remaining time on a troops training timer by 10 minutes.
10 Minute Speedup for Training is known to potentially be obtainable from opening Junior Alliance Boss Package. The links for each item are below:
Note: This list may be incomplete.