Five Days

Greeted this am by a new Reuters article.

The first political caucus in Iowa on January 3 and the first primary in New Hampshire on January 8 could produce the nominee for each party, leaving millions of voters headed to nominating contests later in the spring with the nominees already effectively chosen, they say.

They meaning a few campaign types with dogs in the fight.
A bit far fetched, I think, but at least one party could have things in pocket shortly after the South Carolina primary a little later in the month.
So, yeah, the whole thing could be over but the shouting by the end of January.
Plenty of shouting after that.