The Mistake Before You Start
Humans systematically underestimate the time of future tasks. Psychologists call it the Planning Fallacy. What you think will take two hours takes three. What you plan to finish in a month takes six weeks. When imagining the future, you project the perfect scenario ignoring interruptions and surprises, which in reality are the norm.
The Second Law That Complicates Everything
Parkinson Law: work expands to fill the time available for its completion. Give someone the whole morning to write an email and they will use the whole morning. Give them 20 minutes and they will write it in 20 minutes.
How to Use Both Together
For routine work: apply Parkinson. Set a timer and compress time. For your most important work: apply the Fallacy in reverse. What you think will take two hours, block three. If you finish early, you just gifted yourself found time.
Want to design a week that protects your most important work? Strategic session.