How long it could take to count the vote this year, explained

The big question overshadowing “Who will win the presidential election?” is: “When will we actually know who won?”
The pandemic and historic levels of mail-in voting mean that we have reason to expect that certain states will be very, very slow to count their votes this year — while others will be at least relatively quicker.
Of the six key swing states that will most likely determine the election, the general expectation is that Florida, North Carolina, and Arizona are in a good place to count most of their votes...