I have been practicing case interviews for a while and have attended interviews with several consulting firms. I usually take 2 minutes to structure a case and ask for 30 sec to think of brainstorming questions.
However, my experience interviewing for a corporate strategy role was quite different: (1) I was interrupted after spending only one minute to structure the case. I wasn't able to break down the structure deep enough and some ideas were not clear (as I haven't completed my structure). (2) For the questions asked, I treated them as brainstorming questions, so I always asked time to try to come up with a more comprehensive issue tree structure. The interviewer seems a bit annoyed and expect me to directly come up with my thoughts.
Would like to hear your suggestion for the above 2 points. (1) Should I have asked for more time to structure the case? (2) For the questions asked, how do I make a judgment on whether I need to take time to come up with a more comprehensive structure, or just provide my thoughts instantly? I feel a bit clueless after being used to the standard case interview process and switching to a more fluid conversation.
Note: After finishing the case, I feel that the case itself was much more simplified compared to strategy consulting cases. Probably that was the reason why the interviewer didn't expect me to spend too much time to structure, brainstorm, etc.