Do not forget lost iron and food.
If you reset a 4*+18 hero, you lose 3+ million iron ( 5.36 days for me ) and 3.8+ million food ( 2.79 days for me). So 53.6+ days and 27.9+ days if I reset all my current 3*+Y, and 4*+Y, heroes.
I have also been careful which heroes get my emblems. My Boldtusk 4*+18 is not as powerful as some red 5* heroes, but is very solid ( see notes).
For my play style, this means emblems are permanent except for X*+1 heroes.
Notes
Click for notes
23,310 per hour
or
5.36 days = 3 million iron
56,731 per hour
2.79 days = 3.8 million food
FIN