Alicia, I was thinking of the same route next year. I alloted 24 days for walking from Santander to Santiago, which would be about 14.6 miles per day. I thought with the undulations in topography that was about all I could do. I may be kidding myself, I might need an extra or two to finish. I think you're biting off too much for two weeks. If that time period also includes travel time between home and back, you have to take that into consideration. Instead of overdoing it, take a shorter route from a nearer town or even switch caminos and think about the Camino de Ingles for your 1st Camino. If you started in Ferrol, you would qualify for the Compestela and if you had enough time you could go to Finesterre. You could walk there and take the bus back. Good luck with your plans!