Norte in 10 days

Have a look at this link to see stages on the Norte.
http://caminodesantiago.consumer.es/los-caminos-de-santiago/del-norte/
Note that it ends at Arzua, where the Norte joins the Frances which is still one long days walk or two short ones from Santiago.
Also one of the stages suggests a 41km day, missing the alberge at Miraz which would be a pity, and make for a long days walking.

Personally I really liked the town of Luarca, but starting there might make for a lot of long days to get to Santiago on time.

I would suggest starting from Ribadeo.
A comfortable 10 days and a really nice walk.

Cheers

Andy