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human
Issue with Letter Writer

I'm currently applying to PhD programs. I've submitted applications to 10 programs. One of my letter writers submitted his letter three days late for an application due earlier in the month. I had one yesterday (to my top program, I might add), and he did not submit his letter. I sent him an email yesterday reminding him about the deadline, but I did not get a response. 

I understand that this is a busy week for professors. But, all of my other letter writers managed to submit their letters on time. Should I send him another email today? How should I deal with this? 

Also, I asked him to write my letter in early September. He has had plenty of time.
gpt
This is a really shitty thing for them to do. However, usually you will be ok with it being a few days late. Our applications were due Dec 1 and the faculty review was complete by the 10th. If your letter was sent before the 8th it probably made it into your application packet but that would only matter if the faculty reviewers put off reviewing until the last minute (this is actually a pretty good assumption). After this point though it would be too late. We had final decisions on the 11th and invitations for interviews go out shortly. Most other places I’ve been have a similar timeline.