Just a quick question regarding the LOR. Most of the Physics PhD programs that I've applied require 3 recommendation letters. Two of my professors have already submitted the LORs long time ago (Big Thanks!!!! ), but the 3rd professor has really been procrastinating... Some of the programs I've applied have a deadline by January 15th, and now it's already early February, and he still didn't submit the 3rd LOR despite my repeated reminders. I've reminded him again three days ago and he promised to submit it as soon as possible. But even if he submits it this week, it's already three weeks past the deadline... Well, I'm wondering how much would a (extremely) late LOR affect my application? Is sending an apology email to each school's Admission Office would be of any help?
(Note: I think the 3rd professor's missing LOR is probably the least important among the three LORs. I've only worked with him as a TA teaching Intermediate Classical Mechanics for one semester. The other two professors' LORs are about a continuous two-year biophysics research and a nine-month nuclear physics project.)
Thanks a lot for anyone who have read through my post!