Took me, on a 350-400~ ed at the time, around 20h on normal respawn, looping around the Dryad gardens.
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At the orange arrow, levitate down to complete the loop. There's 18 total elder forest fury and it took that long because i was doing all bestiaries down ther at the same time. If you focus only on elders, you might be able to cut it down to 10-12h i reckon