There were 3 separate ZOOM sessions. First one was the intro, where the program director presented the program and the faculty to all of us. This lasted ~45 mins. Next was the personal interview, with 2 faculty members. This lasted ~30 mins. There were many questions asked, but the interview itself had a pleasant atmosphere; the interviewers were personable.
The last ZOOM session was meeting current students and asking them questions, very helpful!
So basically, you join a zoom meeting, finish it, join the next one at its assigned time.