I'm reading a book called Flow that discusses (amongst other things) the difference between pleasure and enjoyment.
Pleasure is pretty easy. It comes from watching TV, doing drugs, having sex, etc. The key is that pleasure does not necessarily require skill, and the pleasure will eventually wear off. The book describes enjoyment as similar to pleasure, except that it does not wear off. Enjoyment requires a challenge that can be surmounted, the skill (preferably well-developed) to conquer the challenge, and rules that describe how the challenge must be met, and how we know when we have emerged victorious.
Now, consider behavioral economics for a moment. In order for a behavior to exist, a reward must exist. For most of us, rewards need to be quickly associated with activities. If our actions are not rewarded in the timeframe we expect, there is a strong chance that we will discontinue the action (just ask Pavlov!).
Recently I've found myself questioning the timeframe that I use for myself, and I've found that it might be a bit short for the job that I'm in. My timeframe is generally weeks and months. The other people on my team generally think in days or weeks. Other members of the executive team might tend towards thinking in terms of several months (IE quarters). In order to make the best long term decisions, and undertake the activities that best support our long term goals, I need to get out of the habit of being quickly rewarded for the activities I undertake. Enjoyment might easily take months or years.