How Much Time Should You Spend Planning?

When I was brand new in my first professional sales position, my manager told me to "Spend 20% of your time planning and preparing for other 80%. You'll accomplish far more than if you don't." I have made that a rule that to live by for 30 years. That doesn't mean that you take every Friday off. But it does mean that you discipline yourself to adhere to a cycle of planning events and processes.…