At the time of this posting he is about 6 hours into the marathon.
UPDATE: Coming back at 11 hrs. in, I notice that Andrew has a set of white 'beats' headphones on and he's upped the tempo and energy level. He seemed like he was shrewdly pacing himself earlier, but now he's getting a bit more comfortable with the rocking.
UPDATE: I am now using Andrews backing tracks for chops blasting (arpeggios mostly).