Without wishing to get into a debate over the relative qualities of the D roads of northern France, it is roughly 600 miles from the North Sea ferry terminals to, say, Annecy.
You could blast it in a day. Or you could D road it all the way, over two days. Or mix and match, over two. Anything is possible, largely dictated by what time you get up and, in some cases, the size of bladder(s) and the patience - and expectations - of rider / pillion.
You could blast it in a day. Or you could D road it all the way, over two days. Or mix and match, over two. Anything is possible, largely dictated by what time you get up and, in some cases, the size of bladder(s) and the patience - and expectations - of rider / pillion.