The long haired one and I motored over that way last May. If you travel by car, it depends where you get the ferry from. With both driving, you could make it in a day. go to Viamichelin to find a comprehensive route map.
The other way is to fly to Frankfurt/Main airport, not Frankfurt/Hahn, and hire a car or use the German Rail, which is very good.
Use the yellow envelope if you wish any more assistance.