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I just checked the company out, they are a genuine company run by a local from Saint Jean Pied de Port. He can be trusted and provides as good a service as Express Bourricot.
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.
This site is run by Ivar at in Santiago de Compostela.
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