Longest drive in a single day was about 920 km (575miles) fleeing rain south of Munich and driving back home to sunny NL. Did this wt my son, who is at least as crazy as I am. This is to say, max distance per day depends on you and your company, as well as the road and traffic. More sensible folk would do no more than 400 km or so a day.
Cheers,
Bert
