How long do I have to wait to get my next key fragment?

I was getting key fragments frequently when the hextech chests first came out (like 3 a day), but now I'm hardly getting any (I went 4 days without getting a single one). So, I was wondering how frequently they drop or how long I have to wait to get my next one?

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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