I've been having mock interviews on PrepLounge for a few weeks now, and I've started to become reasonably confident in my ability to solve cases well. However, for most of my interviews, both my partner and I tend to take around 45 minutes per case. I just attended a Bain webinar that said first round interviews would be 30 minutes long (2nd round is 40 minutes long), including the case and behavioral interview.
Are the cases going to be shorter than the ones I am mock interviewing, or are both my partners and I preparing incorrectly? I am an undergrad and am applying for mbb internships if that makes a difference.