Here are a few suggestions for your next trip from Gdynia

In 4 hours, you can reach Varšava, Poznaň.

In 5 hours, you can reach Łódź, Vratislav.

In 6 hours, you can reach Berlín, Krakov.

In 8 hours, you can reach Ostrava.

In 9 hours, you can reach Hamburk, Brno.

In 10+ hours, you can reach Paříž, Budapešť, Vídeň, Stockholm, Praha, Brusel, Amsterdam, Vilnius, Bratislava, Curych...