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With 42 days I don't think that you'll need to skip any sections at all. It's very normal to complete SJPdP to Santiago in 35 days or less. I was 58 when I walked my first Camino and I walked from SJPdP to Finisterre in 35 days.
I was walking through a small town with an ageing population of over 3000 ppl that marks the end of a (gronze) stage on the mozarabe and, in advance, checked the availability of grocery stores. One small shop opens daily from 10am to 1.30pm...
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