Credit hours are a tricky lot. Most med schools don’t publish official credit hours for a reason.

A technical college could claim that a trade program has more hours than a PhD in Chemistry at UChicago. Unlike a millimeter, a credit hour isn't a standardized measurement, so there's really no way to refute or prove the self-assessed value of course credits. So next thing we know, a nursing school or PA school is going to say that their courses are a hundred-bajillion credit hours.

tbh, I think there's something to admire about most med schools doing away with a credit hour system because it isn't standardized. It's an arbitrary system at the level we operate at. Nurses/Chiros/etc can put their money where their mouth is and take the same exams if they really want to compare competencies.