My DS had all four wisdom teeth done on a Thursday and resumed normal activities on Monday. As long as there are no complications, it’s relatively simple. First day or two after aren’t fun.
I’m not aware of a specific date. From the USMMA webpage - “Highly qualified candidates may receive early notification of their appointment after complete evaluation of their qualifications. All other candidates will be notified of their status on or about late March/early April of the year in...
TWE - Thin White Envelope (rejection)
QNS - Qualified Not Selected
Here’s a link to the acronym list -
https://www.serviceacademyforums.com/index.php?threads/the-acronym-list.11568/