Here are a few suggestions for your next trip from Gdynia

In 4 hours, you can reach Warsaw, Poznań.

In 5 hours, you can reach Łódź, Wrocław.

In 6 hours, you can reach Berlin, Kraków.

In 8 hours, you can reach Ostrava.

In 9 hours, you can reach Hamburg, Brno.

In 10+ hours, you can reach Paris, Budapest, Vienna, Stockholm, Prague, Brussels, Amsterdam, Vilnius, Bratislava, Zürich...