That is difficult to determine as it depends on the judgment holder and the laws of the state in which the judgment was awarded. Before the judgment can be executed it must be filed with the clerk of the court and signed by the judge. How the judgment holder chooses to collect the debt (wage garnishment, bank account levy, lien, etc.) would also have a bearing on when the judgment is enforced. Of course the judgment debtor also has the option of trying to negotiate with the judgment holder to pay the debt owed.