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It all comes down to this.

A presidential campaign like no other ends Tuesday.

In a deeply divided nation, the election is a real battle between Democrat Kamala Harris and Republican Donald Trump.

We know there are seven battleground states (Arizona, Georgia, Michigan, Nevada, North Carolina, Pennsylvania and Wisconsin) that will determine the outcome, barring a major surprise. But big questions remain about the timing of the results, the composition of the electorate, the influx of misinformation – even the possibility of political violence. At the same time, both sides are prepared for a lengthy legal battle that could further complicate matters.

To win the presidency, a candidate must receive at least 270 votes from the 538 voters in the Electoral College. Each state gets as many electors as it has U.S. senators and representatives in Congress. In most states, including Texas, whoever wins the most votes from electors gets all the Electoral College votes for that state. Texas has 40 electoral votes.

A big question is: how long will it take to know the winner?

Election Day in the United States is now often considered election week, as each state follows its own rules and practices for counting ballots — not to mention legal challenges — that can delay the outcome. But the truth is, no one knows how long it will take before the winner is announced this time.

In 2020, The Associated Press declared President Joe Biden the winner on Saturday afternoon – four days after polls closed. But even then, the AP called North Carolina for Trump 10 days after Election Day and Georgia for Biden 16 days later after manual recounts.

Four years earlier, the 2016 election was decided just hours after most polling stations closed. The AP declared Trump the winner at 2:29 a.m. on election night (it was technically Wednesday morning on the East Coast).

This time, both campaigns believe the race among the seven swing states is extremely close.

The size of the card and the tightness of the race make it difficult to predict when a winner can be determined.

The Associated Press contributed to this story.