If you fill your car with gas, you can empty the tank by going on a significant journey like a road trip — or you can deplete your fuel by running errands for a few days. Either way, eventually you’ll be on empty.
A similar pattern happens with time — each day your allotment is on “full” and you can do something meaningful or memorable with it, or you can piddle it away in small increments that don’t amount to much. Either way, the day ends and your “tank” goes back to zero.
It’s up to you how you use your energy — the petroleum or the physical kind. Don’t run out of either kind of gas without anything to show for it.