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As per the title, why is it some days it just feels like a day can go so fast, yet other days can feel slow? Every day has the same amount of hours, minutes and seconds after all. What is the actual science behind our state of mind when we feel like this?

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Aside: "Put your hand on a hot stove for a minute, and it seems like an hour. Sit with a pretty girl for an hour, and it seems like a minute. That's relativity." - Albert Einstein (apparently) –  Eoin Mar 10 at 17:34
Definitely related to time perception –  BenCole Mar 10 at 18:44
As the time perception article that Ben mentions points out, there are many things that impact time perception. If you get into a flow state where you are working very efficiently and your mind is consumed by the task, time seems to pass very quickly. If you are in a state of anticipation, waiting for or dreading of something happening, time will seem to pass more slowly. This also occurs when you are bored and waiting for the end of the school or work day. The interesting thing is mindfulness. If you enter the flow state while very mindful, time seems to slow, again. –  John Yetter Mar 11 at 5:12

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