Hi! Current V25 here! Assuming the interview format is the same as last year, it starts out with an Admissions Intro Meeting (unsure of the time this year, last year it was at 12:45pm). Then they do breakout rooms with current students and admissions reps and people can come and go as they please until their scheduled interview time.
Once it is your scheduled interview time, you log onto the Zoom link that is sent to you. I had two interviewers (I'm not sure if anyone else had a different number?). The interviewers are faculty, staff, and people affiliated with the school. One of my interviewers was a professor/clinician (I can't quite recall who the other person was at the moment, sorry 😳). The interview itself was very relaxed and conversational.
I encourage you to look here:
Veterinary Interview Feedback List | Student Doctor Network
This is a great compendium of interview questions previously asked at Penn (and other schools as well!) As stated above, my interview was ~30 minutes long. It was definitely one of my favorite interviews. If you are accepted, you will receive a phone call from one of your interviewers the next week (some people in my class heard as early as Sunday, others not until Wednesday). Interview invites should go out through some point in February (unsure when) so if you haven't heard anything yet or at the beginning of January, don't stress!
Hope this helps you and all other candidates this cycle! Best of luck to you all!