The chart
How to read this
足し算 · Addition
Time to solve 100 problems. Lower = faster.
引き算 · Subtraction
Time to solve 100 problems. Lower = faster.
掛け算 · Multiplication
Time to solve 100 problems. Lower = faster.
四則演算 · Mixed math
All 4 operations combined. The hardest — still improving.
誤タイプ · Japanese typo rate
Right axis (0–14%). Japanese typing error %.
Typo · English typo rate
Right axis (0–14%). English typing error %.
What the chart shows
All lines trend downward — and that's good. Lower numbers mean faster, more accurate performance.
The steep drop in 2017 shows rapid improvement as fingers and brain adapted to daily training.
Small spikes often reflect job changes or life events — visible in the data months later.
The current goal: maintain this level for the next 50 years. The real test starts now.
Also tracked — but not in the chart
Wake-up and lights-out time every day
Daily mood score
Work type and shift notes
One-line diary — sometimes longer on hard days
All of it searchable, going back to 2017