[specialist]

Poll sites, yes. Though adding provisional ballots, which are adjudicated later, did create a spike in problems.

Central count for postal ballots, however, absolutely will take days. Please see my other comment.

Many jurisdictions have automatic recounts at certain thresholds. Another delay.

And IIRC there's 3m overseas voters. Those ballots trickle in.

Also IIRC, most jurisdictions certify their elections 3 weeks after the election day.

Given all that:

Most candidates will concede prior to certification when defeat is obvious.

And corporate media will do whatever to boost ratings.

And everyone will whine about bias, coverage, not getting enough ice cream.