Speed of time
To science a minute is a minute and a hour is a hour. There are effects caused by speed and gravity etc. that can change how fast time moves in one place compared to another. But as far as science is concerned when the conditions are all the same a minute is a minute and a hour is a hour. But from a subjective point of view, we all know that this is not the case when it comes to actually experiencing time. Some times it seems like days and weeks just fly by and other times they seem to last a really long time.
My guess is that this is because we measure time differently than a machine does. When we measure time in our minds between now and a random event in the past, we don't really look at how many seconds, minutes, hours or days there has been since that event. What we do is that we measure the amount of change there has been in our lives since that event. If it has been a week an all we have done in that time is go to work, do some repetitive and boring work, watch television in the evening and during the weekend, then it might feel like the time since that past event is very short. But if we instead have been on a vacation for a week and have spent all our time doing new and interesting things every day, then it will probably feel like a lot more time has past since that past event.
Essentially this has to do with how we record information and how that information is used to measure time. We tend to see time as a forth dimension that we move in, but personally I think time the way we see it is an illusion. We are always in the now. But the now is never the same, we are constantly changing the now. And each time we change something, we record it. And by constantly "reading" this recording at the same time as we are experiencing the now, we get a sense of motion in time and space. But information is stored differently. When we do the same things over and over again we develop patterns in our brains for doing these things. And when wee keep doing these things, the details about how we do them tends to be ignored by our long term memory. Whereas memories about new and unique experiences tends to remain in far greater detail in our long term memory. And when looking back it makes periods of time filled with these kind of experiences feel much longer.
Most of us feel that time seems to move faster and faster as we grove older. And the main reason for this is that we usually experience fewer and fewer new things and spend more and more of our time doing the same things and following the same routines. Most of these things don't seem very important to our long term memory, so when we look back, it seems like there is just a few major events her and the rest we can't remember. And it makes it feel as if time has just flied by.
There are of course way to combat this. If we stay aware of this, we can make sure to do more unique things, and pay more attention to the world around us while we do does repetitive things that we can't avoid. It will give us more events to fill our long-term memories with and it will make our time spent feel longer and more meaningful.
The reason I'm writing this now, is because I recently went on vacation to Japan. And on of the things that I noticed was that the time I spent there felt much longer. And so I thought a bit about it and realized that the main difference was that I were in an environment were virtually everything was new to me and where I constantly had to pay attention to what I was doing. Even something as simple as eating became it's own adventure, when I were tasting new kinds of food, drinking soup from a bowl etc. I probably have more memories from my time in Japan than I have from several months of time spent at home doing the same things everyday.