There’s a science to the perception of time. We’ve all got an “internal clock,” and have memory that helps measure duration and distance between events. There’s a word, zeitgeber, to describe those natural occurrences (like sunlight and seasons) by which our circadian rhythms are set. Keeping time is reliant on all kinds of body functions, and the feeling that time is elastic, it seems, has a lot to do with mood, and attention. Sensations that feel good (and sensations that don’t) change the way we perceive time. So do fevers, and depression, and dopamine… More here.
An interesting look at our perception of time this year, and watches are included so it can’t be bad.