Here's the thing...
Met a retired Londoner on the early morning tunnel crossing heading to Morocco, he was aiming to make Cadiz by the end of the following day after an overnight stop just past Bordeoux, that's a whopping 1327 miles according to maps.
Last year we travelled on the tunnel we...
https://youtu.be/XIn-P0swxyM . Earlier this month the N134 runs up into the Pyrennes and the Col du Somport tunnel 8.6kms long that tunnel and by the time you get to the other end you are bloody freezing.