Imagine Bob the elf who is a passenger on the ship travelling to Evermeet from the Neverwinter harbor (sailing from the Material Plane to the Feywild).
Captain of the ship is an elf who already sailed to the Evermeet, so this journey is possible.
So Bob goes to the captain and ask him “How much time would take?”
How could the captain answer? Is it possible to give such an answer at all? Or maybe the journey time would vary from time to time?