My EMT Instructor had a DNP and Ph.D. pretty smart dude.
So LORs are supposed to be asked as soon as you finish the class? I thought most people asked for LORs a few years after they took the courses. So does this mean the LORs do not have to be dated or what?
That's cool he's well-prepared! Not the norm, but really great! (My experience seems to be at least quite common, though, as it is even mentioned as a significant quality issue in EMS by certain EMS textbook authors.)
At the same time, if he has only seen you in class, I doubt he can add much, esp. since the clinical time (excluding skills labs and such) for an EMT-B is so small (~20 hrs required prior to certification). The feedback your instructor gets from that period of time is going to be pretty limited unless you do an EMT-B "internship" semester or something....
I'd think I'd much prefer an LOR from the ER doc where you worked for a year as an EMT-B-certified ER Tech if I were on an adcom.... If it hasn't been said once, it's been said a few hundred times here: the EMT course itself counts for little, if anything, in med school admissions. It's what you do w/ that certification that matters, so go use it
and then get an LOR from your clinical supervisor (preferably an MD/DO).
As far as timing, it is best to get an LOR near the time it will be submitted (as the fresher it is, the better -- a 1 or 2 year old LOR doesn't really say much about you
now and one any older than 2 years is probably nearly worthless). At the same time, you still want to be fresh on the LOR writer's mind, so waiting until you apply might lose you that advantage. This is one more reason why long-term relationships are best for LOR writers and one more reason an EMT instructor is probably not a good option. Instructors you have for several semesters and/or have and then do research or TA for are generally much better as they have a wider foundation upon which to write that flattering letter.