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This is discused in further detail on the the statistics page. While an average human reaction time may fall between 200-250ms, your computer could be adding 10-50ms on top. Some modern TVs add as much as 150ms! If you want, you can keep track of your scores, and see your full history of reaction times.
According to a 2005 review by Paul Cary, while detection times in excess of 30 days do occur for some, they are largely an exception. For example, a 1989 study of chronic users showed a maximum detection window of 25 days at a sensitivity of 20 ng/mL.