Living and working in the US, I have not been able to take a month vacation, however y walked in November y December (in 2 diferent trips) from Lisbon to Tui.
For me, the Camino is so much beautiful in winter, I did the
Camino Frances in November /December 2013. I will be flying across the pond to walk the remaining Tui-Santiago-Finisterre on March 28, and I hope to be in Santiago for Easter Mass.
I walked by myself from Lisbon to Santarem, mostly stayed in Hostels. I was able to find accommodations without any issues. Santarem has a wonderful Hostel, Mario and his wife are incredible. I also stayed a Casa Fernanda, another MUST stay place.
I walked from Casa Fernanda to Rubiaes, it was one of the longest day because la Bruja hill was there. Overall a great Camino.
If I can help with anything let me know.
Buen Camino(or Caminho)
Texasguy