The portal will provide the time. You'll go to the second floor of the courthouse, they'll take the paper slip you got and then you wait.You will be required to make only one appearance in court for jury selections held that day, or serve for one trial (jury selection may take more than one day). There is no "California rule". All counties have different rules for jury duty, or at least San Diego if different. You must complete a juror qualification questionnaire for determining whether you are qualified to serve as a juror pursuant to federal law. If you are a student, you need to go online and fill out the form and request a postponement until you are back in the state. Jurors summoned for jury service in Essex County must report in person at am on their assigned date. Chances are you're going to end up filling out a questionnaire, which the lawyers will use to gauge whether you might be biased. The Criminal Grand Jury is impaneled for three-month terms and is selected at random from the list of trial jurors in civil and criminal cases.