See my tagline.
Research the Election of 1876 and see what happened to the “deadlines” there.
Spoiler alert:
The final decision was not made until one day before President Grant’s term expired.
One day!
That is the only constitutional requirement.
All the rest can be changed by court decisions.
I did notice Bannon in a recent Warroom rant... saying he thought the election outcome would be decided... about half an hour before noon on the 20th of January.
I’d not ignore that...