How many was the most times you ever grinded an instance for a single specific item?

[AskaRay]

I'm aiming to get the healer hat from Void Ark to complete my set. Since the day Void Ark released until now, I have not seen it drop once, and I've done it atleast once every week

Run with me because last week I got it, and it dropped - I shit you not- twice more in that same run.