I'll add my voice to the chorus above.
Student A goes to 4 lectures from 8-noon, takes detailed notes, but the professors go through material very quickly and he is bound to miss several things or have things go over his head. Every hour there is a 10 minute break where the student can chat, eat, use the bathroom etc. This student is probably going to need to go back through the slides or rewatch the lecture again to get everything he needs out of it.
Student B listens to 4 lectures on 1.5 speed. Now the 4 hour lecture block is 2 hours 15 minutes. He can take breaks when needed, slow down, skip through pointless tangents and pause to make sure he solidifies and understands all the material in the lecture. He can take breaks whenever his brain needs to.
Student B not only went through the lectures faster, but got more out of them. Not attending lecture is the closes thing to a cheat code medical school has.