Mastery Challenges
I absolutely HATE that there is only a certain amount of time you can do mastery challenges! I think everything about Khan Academy is great, except that. Right now I have 99% mastered a subject. And then it says I can't practice for another 8 whole hours!! This really needs to change. It seems like I am only practicing for 5 minutes, and then I can't do anymore! I don't believe that anybody likes it like this, and I also believe that there is no point for a timer. PLEASE PLEASE PLEASE change this!
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