Here are a few suggestions for your next trip from Gdynia

In 4 hours, you can reach Varșovia, Poznań.

In 5 hours, you can reach Łódź, Wrocław.

In 6 hours, you can reach Berlin, Cracovia.

In 8 hours, you can reach Ostrava.

In 9 hours, you can reach Hamburg, Brno.

In 10+ hours, you can reach Paris, Budapesta, Viena, Stockholm, Praga, Bruxelles, Amsterdam, Vilnius, Bratislava, Zürich...