Can someone help me with some sale timing?

So the new jhin skin comes for 1350 And I want 2 other skins for 975, But I have 3033 RP So Now I chose the 2 other skins for 975 and I have enough left (1083) for the blood moon jhin **sale**, which is 975. The Question is: When the release of the skin happens, how much time do I have to wait to get the sale?
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