Von der Schweiz nach Dänemark mit dem Zug – die Fahrt dauerte 24 Stunden

I did this trip several times, once with the regular night train (no beds) which was awful, and then a few times during the day (14-15 hours). It’s doable but the poor performance of DB has exhausted my patience. I couldn’t take the nightjet because I have a dog, and it’s considerably more expensive too.