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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Petition bungie to make a "destiny pastimes" section on the app: Ogre riding time- Sparrow tricks- (lists several) Times jumping the hellmouth- *insert others here*