i swear down its true!
we stayed at youth hostel in dufton, set off at 5am, got to alston at 12 in the afternoon and getting to greenhead at 7.30pm .
bunk barn in bellingham setting off at 3am, arriving in byrness at 8am and kirk yetholme at 8pm
Your timings and pacing certainly hold up, so very, very well done. You must have some background fitness even though you say this was your first walk.
Your comment about there being 'No skill' in walking does show some naivety, perhaps skill is a misused word and 'Technique' is more appropriate. Its a bit like swimming or running, most can do it but some can do it faster and further and better than others.
What's your next walking challenge?
Dave.