It only works that way on the Democrat's Caucus.
The Republican Caucus is much more "normal" and is completed in minutes.
The Democrat Caucuses can go on for hours, although I think they do have deadlines they must meet.
You should know who "won" very early tonight if the news media and the entrance/exit pollers know what they are doing.
Its gonna be fun to watch the fallout. The actual caucus process is pretty boring.