It took me six days, including a long last day to Leon. But I don't think I could do it without "warming up" in the first stretch between SJPDP and Burgos.... :)
Hello,
from my experience, October is not necessarily rainy on the Norte - I was very lucky with the weather two years ago, but starting on October 7th from Bilbao, I had just a few rainy days in the four weeks of walking, and most of them were...
With all the caveats you mentioned, yes, I'd say, on average, for me, x1.5 is a decent guess. But I do like my short breaks for a café con leche and something sweet quite often :)
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