Most jury trials last between three to seven days, but some may go longer. You can also call the Jury Information Line at (800) 998-9035.The grand jury is a body of 19 citizens who are charged and sworn to investigate county matters of civil concern as well as inquire into public offenses. So if you show up when called, and they don't pick you for a jury, you're done for one year. If you have questions please call (619) 236-2020. In ALL California courts, including San Diego Superior Court, if a plaintiff wants a jury trial they must ask for it in the complaint. You're allowed to show up two weeks before or after your summons date - should say in paperwork. All counties have different rules for jury duty, or at least San Diego if different. S2 is in San Diego and we're in the SF Bay area. His jury summons happens to match spring break.