One of the domains of the Balanced Life Equation (BLE) mentioned in chapter 8 of IN or OUT book is TIME.
Your life is like a movie tape rolling, and balanced life is a theoretical state that does not really exist. As your own self, and everything around you is in a continuously moving state. And at every moment, there are new inputs that were not available at the prior moment of balance. So, your mind is in a continuous working state on every decision you make, in order to have such balance.
You may choose to make zoom out of a moment and try to make a balance between a phase in your life and not a moment. As you may balance your life in a decade time frame, not on a monthly or yearly basis. For example, you are launching your new startup and you are expecting to be fully engaged with your new business for the first couple of years. Later you are planning to start a new family so by the end of the decade you will be married and owning your dream company. Another time frame is when people divide their lives into stages that are composed of several decades, so when they reach the retirement age they would start to rebalance their lives.