Grace is a period of time allotted to one, or many, in order for repentance (turn around) to take place before irreparable damage and or a permanent judgment is enacted.
Grace is not unmerited favor toward us for a lifetime or eternity from God. A grace period of time can be cut short based on the intensity duration and frequency of sinful behavior. If one does not turn from their evil destructive, or dysfunctional ways, eternal consequences are inevitable that can last, not only for a lifetime, but from generation to generation (everlasting)