If you're going to achieve peak personal productivity, you've got to define peak personal productivity.

 If you are moving with your vehicle, you choose a speed of travelling which will enable you to arrive at the time you expected. Peak personal productivity is your top speed of performance and production that is suit to your set of measurements and standards. You must have a pattern to follow and a speed of activity to maintain. If your target a certain completion and deliver a product, it should be exact and no extension. If you have a good performance and output, you will establish and maintain credibility.