Well that makes me feel better knowing I've got longer to get thereI went to Portugal in the van in January and only had 8 days for he trip in total including travel time so drove both ways non stop (Archaeology field visit rather than a holiday). Left Calais at 9pm and was parked up in Portugal early evening the following day. Obviously you don't want to do that by choice and I personally felt 3 days would have been perfect, stopping somewhere North of Bordeaux and again just past Burgos. The weather was only around 12 degrees, however, beautiful sunny days made it an absolute pleasure to be there.