Hi
rudywip (Rudolf),
congratulations on your invitation to interview with INSEAD.
The date of your interviews has no impact on when you will receive the final decision. You could have both interviews today and still be one of the last applicants to receive the final decision.
Interviewers are volunteers and do the interviews as a way to give back to INSEAD. So, don't expect them to reply right away. If your second interviewer doesn't reply in 2-3 days, you can send a friendly reminder. If no luck after that, try messaging him/her via SMS or any other messenger app (sometimes emails requesting interviews hit their spam folders). If no luck, let your AO know. She'll decide whether to pair you with a new interviewer or wait a bit more.
I hope this helps.
Warm regards
Alex