[tylerz]

One other point that seems to always get left out when talking about preparations and warm-ups, especially regarding time, is that we are all very different when it comes to CO2. That is we are all different when it comes to the following:
- body and blood acidity
- buffers
- CO2 ventilating effectiveness
- metabolism
- rate of metabolism adjustments
- body temperature
- blood volume
- etc...

All which can affect the build-up and sensations of CO2 and ones comfort levels. So, I think we have to take any mentions of "time" worth a grain of salt. It is probably something that can be better compared if we all had a reference static with no breath-up and no warm-up. Then if you find yourself much lower than another, there is a high chance that it will take you more time/technique in a breath-up/warm-up to reach comparable starting CO2 levels.