Thanks to one of the kids on the cross country team I coach, I was able to be a guinea pig and get my VO2 max done as a demonstration for the team. Her dad is a PT professor at the local university so we got to go into his lab and do the test. I will say, this was one of the most grueling tests I have ever done. I may not look like I was dying, but i was. This was the last 2+ minutes.
This was also after a 9 mile run on the street, followed by 20 minutes on the treadmill. (5 minutes in 4 different zones starting at 6:43 and ending at 6:49 and ending with ~10k pace at 5:24)