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Probably I wasn't clear. The 30 videos I watched in the morning were rewarded, then in the evening there were more videos available (generally i check cause sometimes I'm able to watch two or three more videos), I watched about 10 more that were't rewarded, and still there were videos available, but I stop to waste my time.
Today it starts to count another time. I was able to watch 35 videos rewarded, then it continues to allow me to watch videos but another time it stops to account.
I don't know if it matters but yesterday in the morning I reset my ads ID a couple of times due to a video that kept freezing.