In #Europe, I always travel by #train. In the past, that has involved e.g. two #nighttrains (with beds) per direction and a total travel time of ≈ 50 hours each way.
I vote "50 hours"!
However, I also travelled to America and Asia. To America there is no train. To Asia it's very complicated and expensive. Travelling by container ship is even more expensive and takes weeks. To both destinations, I took the plane