So if they are going for 12 days (allegedly) that brings them towards the end of June - they only have July and August, maybe early Sept to go to Europe and with all the places and route they have described, they will either not stop driving and never stay anywhere for any length of time to enjoy the sights, or they will pare back considerably or cancelI don't think they're going till around June 11th, as it was a month from them watching Eurovision
My daughter did a 2 month van trip and only manged some of France and Italy due to stopping and making time to enjoy the places they visited - all I can see is them doing drive bys and blink and you will miss things trip.