Suggestions
Remove Train Common heroes, Train uncommon heroes, Train Rare heroes.
T1 - Train Common Troops - 4 hours
T2 - Train Uncommon Troops - 8 hours
T3 - Retrain Rare Heroes (include pool of S2) - 2 days
T4 - Train Rare Troops - 3 days
T5 - Train Trainer Heroes - 12 hours
T6 - Train Epic Heroes (include pool of S2) - 5 days
T7 - Retrain Epic Heroes (include pool of S2) - 6 days
T8 - Train Epic troops from old troops - 7 days
T9 - Retrain Legendary Heroes - 7 days
T10 - Retrain HotM for HotM - 10 days