I would not worry too much about it.
The interview is not what gets you in or not really. The student does it as a job and they have a fairly generous instruction and after a while if they have a lot of interviews, and they have little time, it gets to be transactional and it is just let's get it over with faster.
I believe Ross doers not pay their students to interview either, so this is voluntold type of thing and if the student has recruiting/etc they have very little time, so don't feel bad. The usual length is 30 mins usually. That's what the students are asked to take and spend. Then they have to enter notes and make recommendations.
P.S. I have known a student interviewer at Ross who put down "do not recommend" and the person still got admitted so just trust the process and you can't change anything anyway

FlyingPig
Hey guys, just finished my interview with a first year student, super friendly. But the interview only lasted 35 minutes, and I’m afraid I didn’t perform well.