Well, I don't think anyone can actually finish a day's worth of material in just one day. What Anki does is it helps you plan out how to spread your material so you use your time efficiently. A day's material is spread to multiple days, but you "learn" (the terminology for the card being due in more than a day) all of them the same day, to repeat it the next day and so on, with delays depending on your recall performance. If you make a mistake, your delay for that card is reduced.
>Anki prevented her from getting through all of the material in the med school decks she got from a classmate.
Ah, that might be a problem. If those decks were poorly made, and they probably were if they aren't something like Anking or copied straight from a source like Pathoma, they might even make one want to quit medical school. Ask me how I know.
> Once I complete the day and still have energy left, I'd move on the the next day and continue until I'm tired.
How can you finish a day without finishing its material? That's what ultimately frustrated my wife. Anki prevented her from getting through all of the material in the med school decks she got from a classmate. She stoped trying it after a few days because her time was better spent studying directly.
> Every classmate I talk to either uses Anki or a local commercial SRS specifically made for my country's med school curriculum/exams.
My experience with a US med school was some students used Anki. Most didn't.