The amount one can do is limited by the number of hours in a day. It’s zero sum, focusing one’s time on something means not focusing on something else. It’s useful to think of money as a way of leveraging one’s time by spending it to eliminate tasks one must do. For example, using a wash and fold service instead of going to a laundromat and doing it oneself will save about an hour of time that can be repurposed. In that way, money for time is leverage on one’s ability to focus on the right things.