Maximal aerobic capacity is reached over multiple minutes and is indicated by a challenged VO2 max.

“The next past that is maximal aerobic capacity. And this is probably actually something like in the eight to 15 minute range, where you're going to reach probably both a maximum heart rate as well as a true VO2 max, which we'll talk a lot more about what that is later. So that is different from the previous one, where you can't reach this in a matter of seconds. It simply takes multiple minutes to get to a position to where your VO2 max is actually going to be sufficiently challenged or an indicator there.”