Why do people need more than one day to tour all of the el camino real

The Camino Real starts in the province of Buenos Aires, Argentina, and ends in Lima, Peru. Was a path that conected the Virreinato del Peru and Mar del Plata, while most of the path was lost, people still tour the Camino Real.

Then, you can see that the Camino Real is really long, around 190 kilometers in total, this is the motive you can't do it in a day, you may need almost two weeks if you wanna tour it.