Hi
I have ridden il Primitivo twice and via de la Plata once. To ride off road, be prepared to push, especially on the Norte. I say this as everyone that I have spoken to states that it is very up/down and if you take the Oviedo route and jump on to the Primitivo, this is the same !!!
Now I am also looking at the Norte, but as I don't have the time, I am thinking of doing it on the road, which personally, is not how I would normally do one, but then again, a lot of the roads on most Caminos follow the original paths and the paths have been adapted.
As for distance/time. It is around 800ks. The VDLP is 1000ks and this took 3 of us 13 days to ride/push and this is a lot flatter. For the road, I am going to do this in 8 days, including going to Finistere and Muxia which will be around 1000ks.
One last thing, are you cycling fit?
Thanks
David