The Pareto Principle or 80/20 rule says that 80% of the output or results will come from 20% of the input or action. (see more at Measuring Productivity)
When this is applied to a typical day, you can expect that 80% of your time will be spent on maintenance, routine work duties, and repeating tasks. This leaves only 20% available for more important things like action steps toward goals, high Return on Investment tasks, ideas, and true relaxation. (Quadrant II of the time management matrix at Priorities) That is why it is critical to use that 20% of time that remains effectively.
Too often, the remaining 20% of the day looks like this:

Ineffective use of free time
80% of it is spent on time wasters: trivia, escape activities, mindless tv viewing. This is what ineffective time use looks like.
The goal of productivity is to use the amount of free time that is available to us to achieve the results we desire. That means using the remaining 20% of the day more like this:

Effective use of free time
80% of it is spent on the important things, and only 20% on time wasters. Remember to Make Today Count!
See also: Pareto Principle (or 80/20 Rule) at Asian Efficiency and How to 80/20 Your Life from Mark Manson.
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