Third consecutive post. Sorry.
I’ve used Thrashina’s formulas to calculate the EXP needed from one ascension to the next. Hope I didn’t get anything very wrong. Here it is:
For 4* hero:
3.1 → 3.60 = 42557
4.1 → 4.70 = 83717
For 5* hero:
2.1 → 2.60 = 48453
3.1 → 3.70 = 104815
4.1 → 4.80 = 173498