California Code, Code of Civil Procedure - CCP § 617

While the jury are absent the Court may adjourn from time to time, in respect to other business; but it is nevertheless open for every purpose connected with the cause submitted to the jury, until a verdict is rendered or the jury discharged. The Court may direct the jury to bring in a sealed verdict, at the opening of the Court, in case of an agreement during a recess or adjournment for the day.