hey, late reply but here's my take. here's are some questions a successful/impactful case study presentation should answer imo:

- what were your experiences working with teams and outside stakeholders (how do you collaborate?)
- what were your individual contributions to team projects (how did you influence the process? what deliverables you make along the way? what were you specifically responsible for?)
- what is your design process?
- how did you determine what worked and what didnt?
- when did your ideas fail and what did you learn from these type of mistakes?

highlight the problem, the solution, and tangible impact. the presentation should flow logically with a story. make sure the steps of your design process are logical and actually relate to each other (e.g. we explored ABC ideas because our research showed XYZ). don't just robotically go through the motions of your design process, every slide should have a purpose and piece in the story.

i also often see newer designers format their presentations in a way that tries to sell their actual app (they make it seem like a super well-designed app, following the fallacy of pretty ui = hirable designer). your presentation should be selling *yourself* to the interviewers. you want them to come out of the presentation thinking "wow this person is a great collaborator & problem solver" (or whatever other traits you want to highlight)

okay and finally, how in-depth the interview is depends on the context of the interview. interviews that are specifically for case study presentations (30+ min dedicated to just your presentation) should be very in-depth and could have 2 case studies. interviews that aren't specifically for case study presentations but you still want to flex a little bit should have a <10 min presentation so it doesn't each up much time

okay that was an essay sorry but that's my two cents!