California Code, Elections Code - ELEC § 10242

The polls shall be open on the day of election between the hours that the governing body determines, but not less than eight consecutive hours. The hours of opening and closing the polls shall be specified in the notice of election, or shall otherwise be the same as provided for general elections. Before the precinct board receives any ballots, it shall cause it to be proclaimed aloud at the place of election that the polls are open.