12 minutes total time but you got to be quick because there's a lot of running around/killing things. You will generally not have enough time to do this one at all. There are only a few watchful ceffyls available and they cannot be tracked.
Steps
Click on box at ( -177, 39, 459 ) Copy/waypoint -177, 39, 459 to pick/start quest.(location verified , the box not is not always up) OR ( -13, 54, -10 ) Copy/waypoint -13, 54, -10 ( 357, -72, 654 ) Copy/waypoint 356.92, -72.24, 654.30
There will be watchful ceffyls on the plains that you have to click on to "look through their eyes" to find a heights stallion (purple and that isn't visible normally). You may need to use several watchful ceffyls until you find the purple one. Run to the spot where it was and use the medallion.
Kill 20 apex stonestalkers (bigger than normal mobs). You can usually find clusters of 3.
Go to the area of the Stratafold that is marked blue in your map (unsure if this changes, mine was around ( 591, 44, 654 ) Copy/waypoint 591, 44, 654).