Hi there,
You should during the whole case interview, strategically distribute the requests for time (e.g. during framework or during difficult questions and/or conclusion), assuming the interviewer will allow you to have any time at all (always judge him behavioural-wise)
I would do the following
1) Ask for time before you lay out your framework and see the response from interviewer (yes/no , body language)
- If you had positive response you can have 1 additional slot to ask for “long time” and maybe another “short time” request - you should always gauge the atmosphere / response / personality of interviewer
2) Assuming you are in the condition to ask for time for a conclusion, it is YOUR CHOICE and according to me a TRADE-OFF DECISION
Scenario A - Do not ask for time for conclusion
+ Shows ability to think on the spot, confidence
- Interviewer could be more lenient on the level of structure and insights in the conclusion
- If conclusion delivered is below minimum bar as for as being crisp, to the point, relevant and structured because of the rush - it will penalize you in the problem solving/structure axis
Scenario B - Ask for time (if allowed, preferred for me) for conclusion
+ Gives you time to structure conclusion in an answer first, logical, business relevant and MECE way
- Interviewer's “bar” for judging your performance is higher, given you took time
- If conclusion delivered is below minimum bar as for as being crisp, to the point, relevant and structured because of the rush - it will penalize you in the problem solving/structure axis
AS per your second question
→ I would penalize a candidate if taking more than 1.30 min without delivering superior content. Would stick to the < 1min- 1.30 to be sure
Hope this helps.
Good luck