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. 

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Casey Briggs, ABC US election analyst