Formula
payback seconds = upgrade cost ÷ (new rate − current rate)
How to collect usable inputs
- Compare rates in the same server and boost state.
- Use the total upgrade cost.
- Enter realistic active minutes per day.
Limit you should keep with the result
If the new rate is not higher, there is no income payback.
For named pets and source context, cross-check the 106-slot Pet Index. For a complete set of decision aids, return to all Steal An Egg tools.