Here are a few suggestions for your next trip from Camburg(Saale)

In 3 hours, you can reach Berlin, Dresden, Nürnberg.

In 4 hours, you can reach Munich, Frankfurt am Main, Ústí nad Labem.

In 5 hours, you can reach Prague, Hamburg, Köln, Liberec, Stuttgart, Szczecin, Dortmund, Most, Bremen.

In 6 hours, you can reach Linz, Wrocław, Pilsen, Liège, Poznań, Salzburg, Düsseldorf, Strasbourg, Innsbruck, Essen...

In 7 hours, you can reach Luxembourg, Brussels, Basel.