Add MASTERY CHALLENGES every 30 minutes – Khan Academy Help Center

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vpsingh1976

August 29, 2017 23:31

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Nathan Moses

August 30, 2017 19:46
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I know! not every 10 hrs!
Aarav Shah

September 04, 2017 15:30
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Sometimes for me, mastery challenges take 24 hours! HOURS!

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