If you do not have time to do things right, when will you have time to do it again? Lack of planning usually leads to a lack of quality (not doing things right).
Planning is time-consuming. However, failing to plan usually ends up with duplication of effort, which is more time-consuming.
An execution mindset is good, but without planning, you can end up executing
the wrong things or things that are least important or rank lower on your priority list. Thus, just a few minutes of planning can lead to many hours saved.
Planning assists you in decision making, which in turn creates progress. It also allows you to evaluate and fine-tune – ultimately leading you to achieve your desired results.