Have full focus on your breathing. So you know what percentage of time you paid attention to your breath.
By directing your attention to your breath, your attention more easily turns to the NOW.
It is estimated that 80% to 90% of our thoughts are counterproductive and even harmful. By directing attention to the breath, your thoughts tend to diminish and even disappear.
This estimate coincides with the Pareto principle. The Pareto principle, also known as the 80/20 rule, is a phenomenon that states that about 80% of outcomes are generated by 20% of causes.
So, to ensure that the 20% of our thoughts are the best. It is suggested to maintain a relaxation/activity ratio of 80%/20%.