Hi fellow Round 2 applicants,
Just stumbled upon this on Darden Admissions blog (by Arielle Greene):
(as a response to recommendation deadline question)
"You are correct – the recommendations should be submitted tonight by 11:59 (EST). However, if your recommendation writers have not submitted by Monday, January 10th, we will contact you to let you know."
It sounds, at least to me, that if your letter is still due, proactively reaching the admissions office and explaining your what is delaying the letter, could still give you a chance to be considered for Round 2.
If you are worried about late recommendation, don't give up the hope! Good luck to all!