I submitted the online application of some programs in time. However, one of my letter writers hasn't submitted his letter yet and told me letters could come late that then application letter, otherwise the school will specify that they have to submit letters by a certain date. I assume this is true since he seems pretty experienced at being a recommender. However, he didn't submit the letter for the program that says "make sure letters be received by the deadline" in the online application. I'm kinda worried if I'm wasting my efforts and money for this school because of the late submission of a letter. Can anyone share some insights on this? Thx a lot!