My scores still haven't posted online, but it shows that they were sent out January 11th, and I was able to get the score by phone on the 11th. Which is good because they had to be at the school by the 15th. With bells on.
Also, because I am self-admittedly a little crazed about this and have learned that when dealing with a bureaucracy of "trained representatives" sometimes you just have to call again and ask the same question until you get a better answer, I spoke to another representative (we'll call her Rep #3) who said that it is regular not business days and that the representative who told me otherwise was a fool and a scoundrel. (Well, perhaps she didn't SAY that, exactly, but her tone was trending in that direction.) I had asked Rep #2 to speak to a supervisor about it, and he said that he had, but in retrospect I think he just put the phone on mute and hummed a Justin Bieber song under his breath. Oh well. All's well that ends well.
The takeaway lesson here, children, is that it is regular and not business days and, also, that you should never take a representative at face value. Poll a few.
Thanks, everyone, for your help!