Time is a fundamental element of our being, and how we perceive the world around us. Our sense of who we are is shaped by how our brain connects our memories, present sensations, and our anticipation of the future. Time is a constant, but we treat time as a variable. We get three days in a single 24 hour block of time. This principle has contributed to my success since I first started using it more than 20 years ago. Along with the other time management principles, I employ, I've used it to triple the number of days I have, and that has helped me triple my amount of productivity.