Employers in California are not allowed to terminate, demote, suspend, discriminate against, or otherwise retaliate against employees for missing work to serve jury duty if the employee gives reasonable notice before taking time off. As a suggestion, it is best for employees to inform employers of jury duty as soon as employees receive a jury summons. Employees who suffer retaliation for serving jury duty are entitled to receive reimbursement for lost wages and work benefits caused by the employers' violation, including getting their job back if they were fired.
This right to participate in jury service without suffering retaliation applies regardless of if the jury duty service requires a short period or many months of service. However, note that employers have no obligation to pay employees for the time they take off to serve on a jury, unless an agreement between employers and employees provides for jury duty pay.
(See Link: Labor Code Section 230)