A:Answer I'm an American from California writing this on Dec 2 2021. I don't know how useful this post might be for you but it could be for other people in the CAN/USA region.
This card (And the other 30-series FE cards from what I observe) all go on sale every other calendar* week particularly early in the morning (Trending from just before 7:00 AM up to just after 11:00 AM. Written in PST) usually on Thursday or Friday. On rare occasions, this card will drop only one calendar week after it was last on sale. Since you live in Korea, the earliest it will drop for you will be at midnight or worst case scenario, just after 4:00 AM. It actually dropped today at 7:00 AM PST, so expect it to be back in a couple weeks starting the 16th.
As for other readers, the last time the 3060 dropped on a day that wasn't Thursday or Friday was April 28, 2021. The last time it dropped on a Tuesday was February 9, 2021. Unless the trend changes, the 3060 is going to drop almost exclusively on Thursday and Friday.
*The reason I say calendar week is because the time in days between a gap, based on a drop history list I was able to get my hands on, can be a couple days shorter or longer due to them dropping on a different day of the week.
TL/DR: Every other week, currently Thursday or Friday at 15:00 to 19:00 UTC 0. Can change. Usually drops multiple times a day.
