Knowing when to stop, and having the discipline to move on to the next challenge, is a great way to get more accomplished. Changing the font of every heading in a report that you've already finished is far easier than picking up the phone and calling prospects.
Details are important.
Doing your best is important. And results are vitally important. Achievement demands more than just being busy. Focus on being effective, rather than being busy. Direct your energy toward getting results, and you will achieve them.