Vox has prepared a viewers' guide to watching the vote tallies tonight, including poll closing times, what to watch for, and how Senate races are going.
Depending on how the early key states (Florida, Georgia, North Carolina) are trending, it could signal either a long night into morning, or an overwhelming trend:
"Polls show Biden competitive in important swing states that will count much of their vote quickly, like Florida, North Carolina, and Georgia. These states are all hugely important to Trump’s electoral math — he really can’t afford to lose any of them, unless he makes truly unexpected gains elsewhere. So if any of these states are called for Biden, he’ll become the favorite to win the presidency.
But if all three of this trio remain uncalled because they’re too close, or if they’re called for Trump, then we could be in for a long count."
As we said this morning, "Keep Calm and Vote Democratic."