Time

Our perception of time is directly related to our awareness of our physical body.

Time goes fastest when we are not aware of our body.
Examples:
Sleeping (we have no awareness of our body and hours pass by in an instant)
Watching a movie(we have minimal awareness of our body as most of our attention is absorbed by the movie and so time goes fast)

However, if that movie is boring, time will seem to go slowly because our attention is not absorbed in the film and we become aware of our bodies once again.

Time goes slowest when we are very aware of our body.
Examples:
When we have to go to the bathroom! Time goes so slow because we are constantly paying attention to our body.
When we have nothing to do and are bored. Time goes slowly because our mind isn't occupied with anything and so we can become aware of our body.

What can we learn from this:
1) Everyone wants to live longer. But longevity of life isn't what is important. Rather, it's our perception of time that matters. If you want to feel alive longer, become aware of your body. This is a central part of mindfulness. Notice the breath moving in and out of your chest or nostrils.
2) If we were completely aware of our bodies, time would seem to stop. For this to happen, our minds would need to be completely still and our attention would need to be on the present. In fact, spiritual masters tell us that when the mind is still and attention is on the present, it is as if time has no existence whatsoever!