If it makes you feel any better....before the APPI went online, we'd have to mail individual packets to each site, and they all had different policies for what they considered the
actual deadline: postmarked by the listed date, received by the listed date, in the hands fo the admin/DCT by the deadline, etc. I still remember having ALL of my site material laid out on the pool table (bright blue felt!), it was a visual reminder of how much I had to do. The top left was the earliest due date, and then my apps went in chronological order from left to right. I made a checklist of requested materials for each packet, as back then some sites requested all sorts of supplemental attachments. One site I considered, but didn't end up submitting, required 7 additional documents: a seperate 4pg application, 2 assessment samples, d/c summary note sample, 4 short-answer questions, undergrad transcripts, etc. My first apps all
just made it out, but most of the onces from Nov 15th or later got out with time to spare. I had a stack of USPS supplies stashed next to my couch, I looked like a fledging small business.

I'd run into cohort mates at the local post office, and we'd all be standing there with our intern apps getting ready to be sent Priority (and a few overnight!). It isn't like the experience was so stressful I can recall all of this like it was yesterday, even though it was 4 years ago.
😱