How long does it take for a skin to go on sale?

So I want the Elderwood Nocturne skin but I'm not sure if I should buy it now or wait until it gets a 50% discount. How much time would I have to wait?
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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