Not official tool to help the player to know the time required to the heroe can get full energy.
You can use the app following this link: https://bombcryptoenergycalculator.netlify.app/#/.
The app doesn't required any permission or network conection to work, once you have charge the page. Only input the information needed to calculate the time of rest required for the heroe.
You can start the app in your development environment, only clone the repository execute npm run serve. Then you can start to do local improvements.
minutes = (Heroe Stamina * 50) / (House extra stamina + Battery skill extra stamina)
hours = minutes / 60
You can collaborate with the project adding an issue explaining the feature / fix what want you add, or creating a fork of the project, adding the changes and last pull request to this repository. Feel free to collaborate, I will be happy to receive suggestions / help