Hi There - We crossed to Le Harve earlier this year and stopped with friends near Poitiers. We then drove easily in 2 days to San Cayentano stopping off at Barcelona overnight. We came down via Bordeaux, Peppignan and then coast road. We used motorways all the way and the tolls were just under é100 euros.
Coming back early March we did the return journey staying overnight at Toulouse which we had made by 7.30 and easily reached the sailing out of Le harve which was due at 17.00. From Bordeaux we took the route through Niort Parthenhay, Saumur Le Mons etc.
Hope this helps
Trevor & Jenny