bundle #1

available: 26 July 2021

expire: 11 August 2021

duration: 16 days

*the first bundle started off a bit late into the month, may be excused as a special reason

bundle #2

available: 11 August 2021

expire: September 8 2021

duration: 28 days

bundle #3

available: 2 September 2021

expire: 27 September 2021 

duration: 25 days

*in conclusion, it’s highly possible that double-month such as September has a slightly shorter duration compared to single-months.

bundle #4

expire: 20 October 2021

available (prediction): 25 September 2021

duration: 25 days

*if all fails, you can at least safely say that each code has a 20 days duration.

*If this doesn’t help anyone, at least it’ll serve as my reminder [emoji]

Kindly let me know if any of my calculation is off and I'll fix asap

Upcoming Prediction

So far, you can also see that there’s a clear correlation between 5☆ banners and the Prime gifts. They release a new Prime gift a few days after every new 5☆ banner is out.

As can be seen, why September is double-month, is because Raiden and Kokomi are in this month.

Henceforth, it means that in the month of November 2021, there will be about 2 new 5☆ characters as well.

Potentially, September can be a special occasion because of the Anniversary. But what does that leave for November? What other special occasion could there be?

*Disclaimer: All of these conclusions are based on official information released by Mihoyo on their Amazon Prime page. I just did the math.

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Minimum Guaranteed 4☆ in 1 Year

Minimum Guaranteed 5☆ in 1 Year

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