I drove down to a village near Pau in one shot 6 or 7 years ago. Took about 15 hours in total (including stops) IIRC. Slightly bonkers admittedly. My in-laws joined us but broke the journey over two days. Memory is a tad hazy but I think they stayed in a Campanile (Travelodge equivalent) in Le Mans which was roughly a half way point for the journey. Cheap and cheerful. http://www.campanile.com/fr/hotels/campanile-le-mans-centre?utm_source=google&utm_medium=maps&utm_content=FRA21949&utm_campaign=Campanile