Thanks for the feedback. I was hoping you would jump in here, since you live in the area.:blink:Whichever direction you choose make sure you leave munich before 12.00 on a Friday otherwise it's gridlock. (it can take 2hrs to travel the 70km to ingolstadt)
I used to travel down the A9 from Berlin to Muchen to work each week just over 550 km and best time was just over 3hrs (average around 4 with traffic), coming from munchen once you get past igolstadt and then nurnberg it's a clear road the whole way and with one of the longest unrestricted sections on the whole german autobahn network :1:
my guess is you could get off the 9 around Leipzig onto the A14 to Magdeburg and then onto the A2 (E30) to Hanover and then join the A7 (E45) north from there....
enjoy the trip, hopefully it's more enjoyable than the previous attempt