Thanks for your detailed post concerning how you give your end of semester oral exams. Very useful to many readers, including me.
You did the math for us, and it came to 6 minutes, not 8. You also had the luxury of having double the time available that I will have to complete my end of semester exams. Apples and oranges, eh?

You are obviously a professional foreign teacher. Great! However what you have posted is mostly inapplicable to my problem with exam time per student. And I'm not going to refrain from following the rules provided to me by my Chinese employer in writing in that regard. Who knows what can happen later if I break said rules! Some Chinese employers are very picky.
Thanks again for an extremely informative post.