Here are a few suggestions for your next trip from Radbruch

In 2 hours, you can reach Hamburg, Bremen.

In 3 hours, you can reach Berlin.

In 4 hours, you can reach Frankfurt am Main, Düsseldorf, Kolding, Essen, Enschede, Dortmund.

In 5 hours, you can reach Odense, Köln, Utrecht, Esbjerg, Horsens, Nijmegen, Vejle, Dresden, Arnhem, Nürnberg.

In 6 hours, you can reach Copenhagen, Amsterdam, Rotterdam, Århus, The Hague, Munich, Groningen, Poznań, Frederiksberg, Liège...