Besides having made time during the 6+ minutes of flight to navigate (setting and resetting altitudes/headings) and to communicate multiple times with ATC, it's hard to conceptualize how at low altitude in day VMC neither pilot had reacted to the obvious increasing cockpit noise from the rush of a air in the slipstream as the jet zoomed to 458 kts IAS and beyond clacker speed to 500 kts. The 29 year old captain's purported 8000 hours' experience level obviously lacked depth in situational awareness and manual control of the thrust levers.