1.
Typical behavioral questions without WHY MBA, why Wharton, why now questions any more:
1. Tell me a time when you faced a conflicts with your team member.
2. Tell me a time when you are not the leader.
3. Tell me a time when you convinced others.
4. Tell me a time when you took the initiatives.

According to the very nice alumni, standard interval is 30 mins, in the end we had 40 mins + including Q&A.