when you work you can observe that the 80% of your important work is finished in 20% of your time and the rest 20% of the less important work takes 80% of your time . so if you can delegate this 20% of the work to your junior then this frees you of 80% of your time . so if one used to work for 10 hrs a day then by following this principle you can finish 80% of all your important work in 2 hrs and enjoy the next 8 hrs in planning how to raise your bar