Hello - we were three and walked comfortably in 3 days from Boswell to Segedunum last May, taking a peak at Newcastle -upon-Tyne and the norrth sea the following morning.
Here are our details: tiny.cc/Hadrians
See also the marathon runner who we kept stumbling over: he started at the same time and we met him several times - which opts for an interesting discussion on the benefits of walking