Does anyone know how long does promotion series from Diamond 1 to Masters lasts?

Is it 3 days or 1 week or 1 month? I know if I don't play the promos during a specific length of time I'd be kicked out of promos no matter what. But I have no clue whats the length time. Does anyone know it?

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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