It’s less than 70 days
According to:
[💫 Memento Rare Quests - #2 by Mariamne]
Shiloh (21Nov’18) - last Farholme (14Jan’19)
And the next 2 rotations:
So an average of 56 days,
you can receive 1 of each
Or has it been spread out? To include all the added extra pilings…