IGN interview with Swen VinckeHe din't rested a single time and i believe that he mentioned a cooldown on 59:45 here >
https://youtu.be/XSc17QXxfyU?t=3586But rewatching seems that is not exactly a cooldown.
The Jump spell gives you 10 rounds of triple jump distance - it does not give you "one and only one jump at triple distance". Swen specifically entered turn-based mode at that time to make sure that those 10 rounds wouldn't expire before he could do his second enhanced jump. This is within the rules as written, even if Swen used a slightly incorrect phrase (not an unusual occurence) to describe it.
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I'm re-watching the stream, and even though the text does say "Cooldown", and Swen uses the word "Cooldown", the power does not return, the button remains greyed out.
The tooltip also calls it a transmutation cantrip, even though it would probably more accurately be described as a daily power.