In reply to robw007: you just need to approach it with a 'big walling' mindset rather than a 'brit trad climber cragging mindset'.
If you can lead, clean and haul a pitch in 1.5hours, then anything you can free will be a bonus - but be careful - changing shoes and stripping down the rack and vice versus can waste a lot of time. I would only bother changing from aid to free set up if there was a reasonable block of freeable pitches, otherwise just stick to the aiding setup.
I bivied on Dolt tower and Camp IV. From Cap IV we went straight to the top - thats 10 pitches virtually all on aid in a 15 hour day.