Stephen Covey in The Seven Habits of Highly Effective People taughts as one habit the ability to think from Desired Outcome.
The ability to think from Desired Outcome is a process of identifying needs: what is necessary to fulfill the needs. Once desired outcome has been identified you have clear idea what the outcome looks like, so you also know when to stop.
We do not need to do as much as we can, we need to so as little as required. Doing more than needed creates waste and waste is not value.