Happiness is open to interpretation. First it depends on whether we surely want to be happy or not. Second, it depends on whether we know what true happiness for is us or not. Third, whether we know what to do in order to be happy. And forth, whether we are actually making effort to be happy.
There are two extreme visions.
Aristotle said in his book, Ethics, "Happiness is more than momentary bliss. There is another condition for happiness; it cannot be achieved in less than a complete lifetime. One swallow does not make a summer neither does one fine day. And one day, or indeed any brief period of felicity does not make a man entirely and perfectly happy." The problem with this approach is that not there aren't too many takers for it. It's difficult to convince people to give up short-term pleasures in order to pursue something over which they might spend their lives, but still not achieve it. One might raise questions as to the validity of this approach for no one knows what happens after death.
Another viewpoint is one that relates to comfort, instant gratification of conscious desires, and thinks of minimizing the time between consciousness of a desire and its fulfillment and also the effort. But then one can never be sure about the limits of human desires nor its stability. One might wish for two completely contrary things within a short span of time. It's difficult to draw a line as to when to stop fulfilling demands, but again if this is not done the desires keep growing exponentially as they get realised.