Six Months of Timestamped Notes Disproved a Developer's Beliefs About His Own Work

A software developer spent six months logging 1,890 single-line timestamped notes in one daily file, then analyzed them with a simple script and spreadsheet. The data contradicted nearly every assumption he held about his own productivity, including his belief that mornings were his most creative time. In reality, 41% of his idea and note entries were written after 9 p.m., while mornings were dominated by logistical tasks like to-dos and emails. A single two-hour evening window, 9 p.m. to 11 p.m., accounted for 23% of all entries across the six-month period. He also found that 94% of logged lines never developed into anything further, suggesting the file functioned more as a mental buffer than a knowledge base.