Here are a few suggestions for your next trip from Rosenau(b Grafenau)

In 4 hours, you can reach Linz, Munich, Pilsen, Nürnberg.

In 5 hours, you can reach Prague, Salzburg.

In 6 hours, you can reach Bratislava, Vienna, Frankfurt am Main, Stuttgart, České Budějovice, Innsbruck, Kladno.

In 7 hours, you can reach Brno, Trnava, Győr, Hradec Králové, Ústí nad Labem, Pardubice, Most.

In 8 hours, you can reach Berlin, Graz, Köln, Winterthur, Olomouc, Düsseldorf, Strasbourg, Sankt Gallen, Essen, Dresden.