How much time should we allow for La Ruta de la Plata?

Hello, I'm considering doing the "Ruta de la Plata" next September. The plan would be to fly into Madrid, head up to León via Segovia and Valladolid, then down to Huelva before returning to Madrid for the flight back. We're in our seventies and limit ourselves to easy, short walks. For accommodations, well-maintained hotels or guesthouses would suit us, and we'd also like to try 2 or 3 paradores. How many days do you think we should allow for this trip? A round-trip flight to Madrid seems the most practical. We've already explored Andalusia but might consider stopping in Seville or Córdoba again. Thanks to anyone who can advise us on the timing, itinerary, or must-see spots...

Hi, After no responses and some research in guides and maps, I’m considering the following route: Madrid - Segovia - Ávila - León - Picos de Europa - Oviedo - Puebla de Sanabria - Zamora - Salamanca - Ciudad Rodrigo - Cáceres - Trujillo - Guadalupe - Mérida - Toledo - Madrid Or extending south to: Mérida Aracena Huelva Moguer Matalascañas Toledo Madrid but that makes for a long stretch between Matalascañas and Toledo. I was thinking of spending 3 nights in Madrid at the end.