In reply to pmorris433:
I did it in 24 hours as bike/run/bike a year ago. I led a group along the path the year before. Basically it is a very nice hilly bit bracketed by boring flat-ish bits.
You will only see the wall itself for about a third of the route, the rest is a mix of existing footpaths and bridleways.
Bivvying is possible, fetch water from one of the lower points and bivvy high to avoid other folk.