Time flies when you're having fun, and time crawls when you're not having fun.
Think about how long an hour feels when you're stuck at a desk doing less-than-exciting things, just waiting for the clock to reach the time when you're permitted to do something you love.
It stands to reason that if we could have fun during unenjoyable activities, we'd theoretically be able to fast forward through them.
For example, I'm teaching karate camp this week, which means six hours of the same twenty kids every day, which means I need an endless supply of patience and emotional strength. It would be very easy to wake up miserable every morning, watch the minutes tick by, and only think about how great it's going to feel when the day is over.
But thinking that way actually makes the day feel slower. If I try to make the best of it, the day goes by faster, which makes the experience itself less miserable and—because time flies when you're having fun—it makes 3 PM arrive sooner rather than later.
If I was sitting at a desk all day, I'd want to make it as enjoyable as possible: keep the area clutter-free, buy some decent speakers to listen to music, and maybe add something to my desk that makes me smile when I look at it.
The point is that the quality of our experience during times we don't enjoy is entirely dependent on our ability to make the best of them. So when I wake up in just a few short hours to spend yet another day teaching the same rambunctious kids, I have to decide whether I want to make the day fly or crawl.
It's up to me, and to you.