Main —> med campus

I’ve got one class at the med school campus this fall semester along with some other classes on the main campus in the same day. I have never done this before. To anyone who has ever made this commute, approximately how long does it typically take? I know that there are some shuttles that travel between the main campus and the med campus but I honestly have no idea how those work. Does the shuttle save you a lot of time compared to regular oc transpo?? Is the commute normally a pain in the butt? I’m kinda scared