Remember that when you are managing time, you are actually managing energy. The true unit of capacity cannot be measured in minutes. It is burned across a period, but it is not the fuel that powers results. All minutes are not created equal. At different times of the day, your energy, your fuel, is much higher and will achieve much more in less time. Consider the ratios carefully. The key to maximum productivity is not time management, but rather energy management. One must allocate their energy investment where (strategy) and when (timing) one can achieve the most.