Elections officials [in California] have approximately one month (28 days for presidential electors and 30 days for all other contests) to complete their extensive tallying, auditing, and certification work (known as the ‘official canvass’). Most notably, voting by mail has increased significantly in recent years and many vote-by-mail ballots arrive on, or up to three days after, Election Day (vote-by-mail ballots postmarked on or before Election Day and received by the county elections official no later than three days after the election are included in the canvass).