Thank you very much for your prompt answer SideBurn. Your answer is very helpful and has clarified what I thought i.e.. power output continues beyond VO2 max but using the anaerobic (lactic acid) pathway.
VO2 max is simply the point at which your body cannot take in any more oxygen, it is not linked to your maximum power output. You can continue to produce more power, but it is thought that this power is produced in a less efficient way ie anaerobically.
Or are you asking how that power is produced?
You would continue to use energy as before, presumably adenosine triphosphate (ATP) the lactic acid produced can be recycled and used as energy. Pyruvate provides energy but in a slightly different way according to whether it is produced aerobically or anerobically.
I would have to dust the books off to provide an authoritative answer! This is from memory; has this helped at all, or am I off target completely?
Just to be clear, this is how some teams used to do it i.e. miles, miles, miles and more miles with a garnish of miles! 'Speed' came from lots of racing.
But, to the point, they are riding about three quarters of the distance of the target race (Tour of Flanders). Today Team Sky are all about quality, not quantity. It is also worth remembering that 200km is about 5 and a half hours riding time!
Instead of asking how much, try thinking variety (quality), fast, slow, turbo (static bike) a few weights, group, solo etc. I would suggest that you should focus on speed and not distance or stamina.