Time spent doing everything before you leave (bathing, eating, etc), travel time, time walking from O Lot (not a short walk), then you have to listen to the lecture live which means it is at 1x speed, then walk back to your car (again, not a short walk; you’ll spend about 20 minutes total walking round trip), then travel time back. For me, this easily would take over an hour total each time. Hours are precious gold/precious bitcoin in med school.
Or you can stay at home and wait until the lecture video recording is posted online. I could watch the lecture twice at 2x speed, taking breaks when I saw fit, in less time than it took me to actually go to lecture.