Register at the JPORTAL website and complete your juror questionnaire. You can sign up for text or email notifications or request an excusal or deferral.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). I just got a jury summons and it says I have to call in for a full week to see if I'm needed. Last time I was summoned, about a year ago, it was for a day. Being a juror, civil and criminal cases, selection of jury, importance of a jury, the conduct of the trial, opening statements, witness and other evidence. There is no "California rule". All counties have different rules for jury duty, or at least San Diego if different. See the United States Courts Jury Service webpage for information about serving on a federal jury. The Juror Experience.