duration() :
This function is an override of the duration() function from the UpgradeabilityProxy contract. It returns the reconfigurationDelay, which is the amount of time that must pass before a new implementation contract can be set. This is used to ensure that the upgrade process is secure and that the new implementation contract is thoroughly tested before it is set. (autogenerated documentation)
state(uint256,,uint256) :
This function is used to determine the state of a ballot. It takes two uint256 parameters, and returns a BallotState. It checks if the current block timestamp is greater than the configured timestamp plus the reconfiguration delay. If it is, it returns the BallotState.Approved, otherwise it returns BallotState.Active. (autogenerated documentation)