Time Leakage
What does the calendar tetris cost over 20 years?
The Calendar Tetris
20 minutes, 104 times/year, 20 years — the long-term cost is 693 hours.
How the number's built.
The calendar rearranging feels like a small interruption. At 20 minutes across 104 occurrences a year, it becomes 693 hours over 20 years.
If you changed one thing
Half the pattern stays.
347 hours return.
No rush. It keeps until you want it.
A way through
cutting the pattern in half
17.3 hours/year returned
× 20 years = 347 hours returned
The Math
20 minutes / occurrence
104 occurrences / year = 34.7 hours/year
× 20 years = 693 hours
Assumptions
- Each occurrence lasts 20 minutes.
- 104 occurrences happen each year.
- Timeline spans 20 years.
- The calculation counts calendar time, not whether the time was useful.
The arithmetic of calendar tetris
Last reviewed: May 2026.
An estimate built for reflection — not financial, medical, or legal advice. The figures follow the assumptions above.