Explorer Mage's teleport skill delay

My friend has a level 124 bishop, and while training it for him I saw that there is a second, second and a half delay between each time you can use the teleport.
It's super annoying and makes the skill obsolete. Is this normal or a bug? In the skill description it doesn't say a thing about burn out and since it's a first job skill I'm worried it applies to all explorer mages.

August 31, 2019