An interesting series of surveys conducted by the eminent psychologist Howard Gardner in six countries shows that what people care about most is time well spent - and what they most resent is time wasted.
So we may enjoy a mediocre meal spent with good friends more than a great one spent with poor company. We enjoy anticipating holidays as much as being on them (and the retrospective pleasure of remembering them). And we get particularly annoyed by things like queues and dud experiences.
All of this may seem like a statement of the obvious. But most people aren't that good at managing their time well. Often we get trapped in habitual activities that give us little pleasure. Some of these may be addictive, including a lot of time spent online.
The research is also a reminder why work needs to be meaningful not just remunerative. And one nice part of it is the conclusion that it's sometimes good to daydream and reflect - the best time often isn't programmed or planned.