As I think I've mentioned above, I did not feel super great after the interview. It could have been due to the fact that this was my first interview, my first MMI, etc. but I still was accepted! I'm not sure whether I actually performed better on the MMI than I thought or if they overlooked my performance for other positive aspects of my app haha. Either way, I'll tell you how it went for me!
For most, it depended on the stations. Some stations ended earlier than others (i.e. I did not use the full time). Definitely don't try to talk for the full 8 minutes. They want to have a conversation with you and be able to ask follow-up questions to push you further. I think early on, I tended to ramble a bit due to nerves and apparently that was ok. There was definitely at least one station where I talked for too long and didn't leave adequate time for a follow-up.
Regardless, it was a super super low key, low stress day and very enjoyable IMHO. Just try to stay calm! I think most of the prompts I saw really did push for conversation (when it was obvious that that was the goal!) GOOD LUCK!