Hyper-Detailed Time Blocking Every 15 Minutes

Planning every 15-minute increment often consumes more time than actual work—users report spending 10% of their day rebuilding schedules after interruptions. Cal Newport's method works in principle, but a single phone call or meeting overrun cascades into a full rebuild. Compared to #3's 15-minute blocks, the Pomodoro Technique (ranked #4) at least allows for task flexibility. For knowledge workers, this rigid system reduces productivity by 15% versus flexible planning.