I drive from Channel Tunnel Calais to Kempten in Germany on 18.06.19 what would be the quickest route [closed]

If you really want to optimize the time, your best shot is to follow the real time advice from Google Maps (or equivalent).

Currently the fastest route stays in France most of the time and only crosses into Germany at Baden Baden. If you want more driving in Germany you can go through Belgium and cross around Bitburg. But that's 20 minutes more of "normal" driving time and it's unlikely that you could make this up by going "fast".

Keep in mind: while some Autobahns in Germany have no speed limits, the actual speed you can go safely is often fairly limited by construction, traffic, road conditions, weather, and varies greatly during the day and from one day to another. So the occasions, where you can actually make some time will be quite limited and its also not really predictable. That's the value of real time navigation that's based on current traffic and road conditions.