Donald Trump and Kamala Harris have made their final pitches to the American people and voting is finally underway in the United States after a tumultuous campaign.  So, when the polls close, how long will it take for the votes to be counted and a winner to be declared?  Today, the ABC’s US election analyst Casey Briggs explains how it could unfold, when to pay attention and what to watch out for.  Featured:  Casey Briggs, ABC US election analyst