Decremental Timebox → Real Time Conversion Table

This entry is part 13 of 22 in the series Timeboxing Trilogy

For your referential pleasure, I made this little conversion table. That time sure adds up!

Decremental Timebox → Real (=Full) Time Conversion Table
(Key assumption: 1 minute decrement, so 4 minutes → 4 minutes + 3 minutes + 2 minutes + 1 minute)

  • 1 minute → 1 minute
  • 2 minutes → 3 minutes
  • 3 minutes → 6 minutes
  • 4 minutes → 10 minutes
  • 5 minutes → 15 minutes
  • 6 minutes → 21 minutes
  • 7 minutes → 28 minutes ~ 1/2 hour
  • 8 minutes → 36 minutes
  • 9 minutes → 45 minutes
  • 10 minutes → 55 minutes ~ 1 hour
  • 11 minutes → 66 minutes  ~ 1 hour
  • 12 minutes → 78 minutes
  • 13 minutes → 91 minutes ~ 1.5 hours
  • 14 minutes → 105 minutes
  • 15 minutes → 120 minutes = 2 hours
  • 16 minutes → 136 minutes
  • 17 minutes → 153 minutes
  • 18 minutes → 171 minutes ~ 3 hours
  • 19 minutes → 190 minutes
  • 20 minutes → 210 minutes  ~ 3.5 hours
  • 21 minutes → 231 minutes  ~ 4 hours
  • 22 minutes → 253 minutes  ~ 4.25 hours
  • 24 minutes → 300 minutes = 5 hours
  • 25 minutes→ 325 minutes ~ 5.5 hours
  • 26 minutes → 351 minutes ~ 6 hours
  • 30 minutes → 465 minutes = 7.75 hours ~ 8 hours
In real life, you’ll actually want a decremental timebox (or…series of decremental series of timeboxes or…decremental series of timeboxes…depending on how you wanna look at it) that adds up to slightly less than the “full real time. So, a 10-minute series would work best if you have 1 hour of real time. Why? Because you’re going to accumulate some time loss every time you get up to reset the timer — if you do your resets manually, that is.
Series Navigation<< Timeboxing Trilogy, Part 9: Birthlines And TimeboxingTimeboxing Trilogy, Part 10: Timeboxing, Tony Schwartz and Recovery >>

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  4 comments for “Decremental Timebox → Real Time Conversion Table

  1. Agent J
    December 24, 2011 at 13:17

    That’s really amazing actually. Kind of like… multi-core processing logic for getting things done… but in a more linear way.

  2. Tommy Newbhall
    December 24, 2011 at 15:44

    huh yeah I never looked at it that way. I didn’t have much success when I tried doing incremental timeboxing last time, but maybe I’ll give it another shot.

  3. December 25, 2011 at 14:42

    Can anyone plz tell me why 55 minutes becomes 1 hour?

    • Kimura
      December 27, 2011 at 16:09

      Rounding, and to account for manual reset of the timer (if you’re using Anki, it can’t auto-decrement).

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