While doing the mission for the eris urn bounty I was able to land on the Ogre and stand on him for 26 Seconds. Challenge is on guardians
Here it is from a second angle: https://www.youtube.com/watch?v=1Em_St3dee0
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Yeah well... I once danced on Phogoth's head for three seconds so beat that... it took an hour to get onto his head btw. Hint: Aim for the shoulders and the chains on the shoulders to land it. Otherwise you fall through his head, but you can approach it from the neck...