From what I understand, this is on a per-school basis. I was in a similar boat for Kellogg on the last day where I couldn't get hold of one of my recommenders for a few weeks before it was due. When I called Kellogg the first time, they said they don't hold it against you as long as the recommendation turns up before March 1st. However, second time around, they said it needed to be submitted by the end of the week. It seems like it depends on the school and the person you talk to in that school. However, my limited experience tells me that they're reasonable enough to not hold it against you as long as it turns up within a few days of the deadline.

Apologize that I couldn't be of more help.

-Rajat