Sometimes I don't get credits for answering questions. I didn't even answer 3 questions yet. What's up with that?

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First, wait a bit for the +300 credits thing to pop up. Two, wait some time between each question/answer to get the points. Three, make sure you answer the questions within the same day. For instanse, if you answer 3 questions like at 1 am, it's the same thing if you answer questions later on at 4pm in that same day, which you won't get credits because it's on the same day.

that happened to me one day and i didnt get to even get any points for the whole day